AMD Radeon RX Vega Review

AMD Radeon RX Vega: Vega 56, Vega 64, and liquid-cooled Vega 64 tested. Find out whether RX Vega was worth the wait. by brad chacos

After months of teases and delays, the wait for Vega is finally over. First, AMD launched its flagship Radeon RX 64 lineup: the Radeon RX Vega 64 and the liquid-cooled Radeon RX Vega 64, which is only available as part of a convoluted “Radeon Aqua Pack” bundle. (After the initial wave of availability, virtually all available air-cooled Radeon RX Vega 64 cards are only available in Radeon Packs as well.) Then on August 28, the Radeon RX Vega 56 hit the streets. And for the first time in a long time-over a year, in fact— the Red Team is fielding high-end graphics cards capable of challenging Nvidia’s enthusiast-class hardware.

These are the first high-end Radeon chips built using the 14nm technology process, following in the footsteps of AMD’s mainstream-focused Polaris graphics cards. Does Radeon RX Vega wrest the performance crown from the ferocious GeForce GTX 1080 Ti? Spoiler alert: Not even close. But Vega provides an intriguing-and sometimes compelling- alternative to the GTX 1070 and GTX 1080, even if it isn’t the walk-off home run that AMD enthusiasts have been hoping for ever since Radeon marketing took a swipe at Nvidia’s next-gen Volta graphics architecture eight long months ago.

MEET RADEON RX VEGA 56 AND RX VEGA 64

AMD sent PCWorld every version of Vega for testing, including both the air-cooled and liquid-cooled versions of the Radeon RX Vega 64. While the design and cooling obviously differ, the two models share the same underlying hardware.

The water-cooled Vega 64 hits higher clock speeds (and thus higher levels of performance) thanks to its embrace of liquid, but unfortunately we can’t recommend it. The card sure looks pretty but it disappoints on pretty much every other front, doubly so because it’s available only in a pricey Radeon Aqua Pack edition. We’ll get into the details through the review, or you can cut straight to the chase in our Buying Advice section.

Vega 64’s technology mirrors that of the Fiji GPU found inside older Radeon Fury X in many ways. Both GPUs pack 4,096 steam processors, with 64 compute units (hence the name), 256 texture units, and 64 ROPs. Likewise, the Radeon RX Vega 56’s innards resemble those of the Fury X’s similarly cut-down sibling, the Radeon Fury. But the compute units inside Vega are “next-gen CUs”-more on that and other deep-level tech later-and Vega distinguishes itself in more obvious ways, too.

The Radeon Technologies Group tuned Vega to run at far higher clock speeds than its predecessor. While the Fury cards hovered around 1,000MHz, the air-cooled RX Vega 64 baselines at 1,247MHz, with a rated boost clock speed of 1,546MHz. The liquid-cooled version pushes that even further, to 1,406MHz base and 1,677MHz boost. Vega 56, meanwhile, bottoms out at 1,156MHz and boosts to 1,471MHz-or potentially more. While the boost clocks of previous Radeon

Radeon RX Vega64 Liquid CooledRadeon RX Vega64Radeon RX Vega56
ArchitectureVega 10Vega 103,Vega 10
Manufacturing

process

14nm14nm14nm
Transistor Count12.5 billion12.5 billion12.5 billion
Die Size486mm2486mm2486mm2
Next Gen Compute Units646456
Stream Processors4,0964,0963,584
Base GPU Clock1,406MHz1,274MHz1,156MHz
Boost GPU Clock1,677MHz1,6546MHz1,471MHz
Memory Bandwidth484MB/s484MB/s410MB/s
Peak SP PerformanceUp to 13.7 TFLOPSUp to 12.7 TFLOPSUp to 0.5 TFLOPS
Peak Half Precision PerformanceUp to 27.5 TFLOPSUp to 25.3 TFLOPSUp to 21 TFLOPS
Texture Units256256256
Peak Texture Fill-RateUp to 429.3 GT/sUp to 395.8 GT/sUp to 330 GT/s
ROPs646464
Peak Pixel Fill-RateUp to 107.3 GP/sUp to 98.9 GP/sUp to 94 GP/s
High Bandwidth Cache (HBM2)8GB8GB8GB
Memory bandwidth483.8 GB/s483.8 GB/s410 GB/s
Memory interface2,048 bit2,048 bit2,048 bit
Board Power345W295W210W

cards were a hard maximum, AMD is mimicking Nvidia’s methodology for Vega. The listed boost clocks for the Radeon RX

Vega 56 and 64 “represents the typical average clock speed one might see while gaming” now, to quote AMD’s reviewer’s guide. Groovy.

Vega’s memory capabilities took a turn for the better, too. Like the older Fury cards, Vega uses cutting-edge high-bandwidth memory. But while the Fury cards utilized first-gen HBM that was limited to 4GB of capacity—and can now struggle in some high-end games because of it—the Radeon RX Vega lineup leans on a more advanced HBM2 design with 8GB of onboard memory. At 484GBps, RX Vega 64’s memory bandwidth is actually slightly less than the Fury X’s total (it hit 512GBps) due to the use of fewer HBM stacks on-die, but still far ahead of the GTX 1080’s 320GBps via 8GB of GDDR5X memory. The 11GB GeForce GTX 1080 Ti offers identical memory bandwidth to Vega 64, while Vega 56 is slightly slower at 410GBps.

With 8GB of HBM2 you’re unlikely to hit a memory bottleneck anytime soon—that’s doubly true thanks to an innovative new feature enabled by Vega’s high-bandwidth cache controller. Again, more on Vega’s big new tech features later.

The air-cooled Radeon RX Vega 64 will be available in two forms: a basic version that looks like the reference versions of the Radeon RX 400/500-series Polaris graphics cards, only longer, and a Limited Edition with a brushed aluminum exterior. Limited Edition cards will be sold only to initial RX Vega 64 buyers until supplies last, and AMD wouldn’t say how many are being produced. All Vega cards include a backplate. We’re reviewing the standard models but took a picture of the Limited Edition at AMD’s Vega announcement at Siggraph.

The Radeon RX Vega 56 looks similar to the standard RX Vega 64. While they both mime the Polaris reference cards at a quick glance, the Vega cards are longer (despite using space-saving HBM2 memory) and ditch Polaris’s plastic shell for sturdier metal materials, including a backplate. The Radeon logo on the side edge of Vega cards glows red. More importantly, the Vega cards use a vapor-chamber cooler that improves upon

the basic blower fan of Polaris. In the photo below, you can compare the Vega 56 (at top) to the Radeon RX 480 reference card.

We’re also reviewing the liquid-cooled version of the Radeon RX Vega 64. It bears the same brushed-aluminum design as the air-cooled Vega 64 Limited Edition, but ditches the blower-style fan in favor of integrated water-cooling with a 120mm radiator, similar to the Fury X’s design. From its stark, unblemished face to that ruby-colored R in the corner, the liquid-cooled Vega 64 is gorgeous-so much so that my non-techie wife walked into my office, saw the card in its box, stopped dead in her tracks and gasped, “God, that’s beautiful.” That’s a first.

But any points this card gets for attractiveness are offset by the ill-conceived tubing for the liquid-cooling. The older Fury X featured shorter tubing that sprouted from the end of the card, providing just enough length to install its 120mm radiator in the optimal fan spot at the rear of your case. By contrast, the liquid- cooled Vega 64 awkwardly sprouts its tubing from the very

front edge of the card, just behind the I/O bracket—and directly underneath where your radiator will likely be installed in your case. That could’ve been okay with short tubing, but Vega 64’s liquid-cooling tubes are actually longer than the Fury X’s (as you see below), yet too short to be able to comfortably route back around the end of the card.

The end result? We had to tuck the problematic bundle of liquid-cooling tubes

underneath the card. It wasn’t very attractive and would’ve likely caused some headaches if we’d had other PCI-E devices installed in our mid-tower PC case. Longer tubing is handy for installing reservoirs elsewhere in your case, but this design feels like it could be more refined.

Radeon RX Vega cards include a trio of DisplayPort 1.4-ready outputs and an HDMI 2.0 port. The architecture’s updated display engine can support up to two 4K/120Hz panels, or a trio of 4K/60Hz displays. That’s a whole lot of pixels! And of course, Vega cards support AMD’s FreeSync technology, which eradicates stuttering and screen-tearing on compatible monitors. It’s a major factor in the value proposition that Radeon marketing is pushing for Vega.

Both versions of the Radeon RX Vega 64 also sport the nifty “GPU tachometer” feature that debuted with Fury. A line of LED lights above the power connectors flash to life correlating with the GPU load. The harder you put the pedal to the metal, the more lights flare up.

It’s silly, but I adored it in Fury and I still adore it now. There’s just something satisfying about seeing the GPU tachometer start shining

when you boot up a game (see above).

RADEON RX VEGA POWER PROFILES

All Radeon RX Vega cards also pack a pair of 8-pin power connectors, and for good reason. The air-cooled version of Vega 64 is rated for a whopping 295 watts of total board power, and the liquid- cooled model pushes that all the way to 345W. By contrast, Nvidia’s GTX 1080 has a 180W TDP and only requires a single 8-pin power connector. Vega 56, on the other hand, has a less imposing 210W TDP.

AMD’s liquid-cooled Vega 64 review box explicitly states that the card needs a minimum of a 1,000W power supply, compared to the air-cooled version’s 750W requirement. Hot damn. You’ll be able to get by with a less-powerful PSU if you have a quality 80 Plus-rated one, though.

AMD is combating those power concerns by introducing six different power profiles for Radeon RX Vega. If you open the Global Wattman

ModelCooling TypeVBIOS ModePower Balance
Power SaverBalancedTurbo
AirPrimary165W220W253W
RadeonSecondary150W200W230W
RX Vega64LiquidPrimary198W264W303W
Secondary165W220W253W

overclocking section of Radeon Software’s settings, you’ll find a new “performance profile” slider. By default, it’s set to a Balanced profile, which balances performance and energy/acoustic considerations. You can also opt to use a Power Save profile, a full-throttle Turbo profile, or create a custom plan. (Don’t forget to click Apply to make your decision stick.)

But wait! That’s not all. Radeon RX Vega also includes dual BlOSs, swappable via a tiny toggle switch on the edge of the card, over the “Radeon” branding. The secondary BIOS uses the same performance profiles as the first, but uses even less power-significantly so, in the case of the Turbo profile. The table above has the GPU power limits for each profile on the air- and liquid-cooled Vega 64 cards, per AMD:

Unfortunately, time constraints prevented us from testing the various power profiles extensively. AMD says activating Turbo mode in the default BIOS adds just 2 to 3 percent more performance across several games, but didn’t declare how much power it uses.

Conversely, the company says activating the Power Save profile improves performance- per-watt significantly, though its materials don’t directly show the mode’s effect on overall frame rates.

AMD is also (rightfully) keen to point out the power-saving features baked into its Radeon Software. The Radeon Chill feature introduced in Radeon Software Crimson ReLive can greatly reduce overall power use by detecting your inputs and intelligently ramping down the GPU when you’re idle. Unfortunately, it’s off by default and limited to whitelisted games, but that list is up to almost 40 of the most popular games around, like Witcher 3, Fallout 4, Battlefield 1, Skyrim, GTA V, Rocket League, and all the major e-sports titles. If you play any of the games, be sure to enable Chill for it in Radeon Settings.

Radeon Software also includes a Frame Rate Target Control feature (go.pcworld. com/tcf) that lets you cap your target frame rate manually to save even more power and reduce noise output. If you have a 60Hz monitor, for example, you could set FRTC to

60fps and prevent your GPU from pumping out frames that would go unseen. You might not want to do that in Twitch-based games where keeping latency to a minimum takes priority, though. You can enable FRTC in the Global Settings section of Radeon Software’s Gaming tab.

But enough about the basics. Let’s dig into Vega’s most noteworthy new technical features.

NEW TECH FEATURES

Few of Radeon RX Vega’s new underlying features come as a surprise, as AMD already pulled back the curtain on the key details during the Vega technical preview at CES in January. We’ll cover the highlights that will most likely make a difference to everyday gamers here, but hit that link for more details, or check out this white paper on Vega’s architecture.

Most interesting might be Vega’s revolutionary new high- bandwidth cache and high-bandwidth cache controller, which creates what Radeon boss Raja Koduri calls “the world’s most scalable GPU memory architecture.”

As we wrote in the technical preview, the high-bandwidth cache replaces the graphics card’s traditional frame buffer, while the cache controller provides fine-grained control over data and supports a whopping 512 terabytes-not gigabytes, terabytes—of virtual address space. Vega’s HBM design can expand graphics memory beyond onboard RAM to a more heterogeneous memory system capable of managing several memory sources at once.

That sounds like a feature best suited to data center workloads—and AMD is indeed rolling out Radeon Instinct cards for machine learning based around the Vega architecture—but a new Radeon Settings feature makes it useful for gamers, too. If you open Radeon Software’s Gaming tab and head to the Global Settings, you’ll see a new HBCC Memory Segment section.

That slider lets you allocate a portion of your system’s main RAM to gaming, combining with RX Vega’s 8GB of onboard HBM2 to create a larger memory pool. “The

See the HBCC Memory Segment slider at the bottom?

high-bandwidth cache controller will monitor the utilization of bits in local GPU memory and, if needed, move unused bits to the slower system memory space, effectively increasing the size of the GPU’s local memory,” AMD explains.

That sounds awfully intriguing, and it could theoretically prevent stuttering and slowdowns in extremely taxing games. Unfortunately, time constraints prevented us from testing the feature, and to be honest, using more memory than the native 8GB of HBM2 can handle might prove difficult.

Color me excited though, especially because AMD says the HBCC can also improve overall memory utilization in games, raising minimum frame rates.

Vega also includes revamped “next-gen compute units” that can perform two 16-bit ops (aka FP16) simultaneously, which isn’t possible in previous AMD GPUs. AMD calls the feature “rapid packed math.” Rapid- packed math wouldn’t work with all aspects of a game, but functions that can utilize it (like some lighting, procedural, and post­processing effects) can essentially be doubled, as demonstrated in the February Vega demo where enabling RPM allowed a system to render 1,200,000 hair strands per second, as opposed to 550,000 with RPM disabled.

Far Cry 5 will support rapid packed math. Steve McAuley, the game’s 3D technical lead, says the game will run faster, at a higher frame rate, and at a more stable frame rate as well. Wolfenstei’n II:

The New Colossus will also support RPM in some way.

Vega has a couple of other features designed to improve performance by working smarter, not harder. Rendering a scene is a complex process. A new programmable geometry pipeline can use primitive shaders to identify polygons that aren’t visible to the player and cull them quickly, allowing the GPU to start rending the geometry you can actually see faster.

Yay, efficiency!

Vega’s pixel engine introduces a “draw stream binning rasterizer” that also improves efficiency and, hence, performance. After the geometry engine performs its (already reduced amount of) work, Vega identifies overlapping pixels that won’t be seen by the user and thus don’t need to be rendered. The GPU then discards those pixels rather than wasting time rendering them. DSBR should also reduce the load on RX Vega’s memory.

It’s similar to the tile-based rendering that helped give Nvidia’s GeForce graphics cards a tremendous boost in efficiency starting with the Maxwell architecture, though it remains to be seen whether AMD’s solution is as effective.

And get this: Vega is fully compliant with Microsoft’s DirectX 12 level 12.1 features.

RX VEGA RADEON PACK BUNDLES

Before we dive into performance testing, it’s worth noting the unconventional way Radeon RX Vega is being sold. Sure, you can buy stand-alone versions of the air-cooled Radeon RX Vega 56 and RX Vega 64 at their respective and price points, but AMD’s also selling the graphics cards at a markup with Radeon Packs that offer bundled games and another in discounts on Ryzen and FreeSync hardware. The liquid-cooled RX Vega 64 is only available as part of the Radeon Aqua Pack. You can’t buy it as a stand-alone.

It sounds simple enough, but the situation’s actually somewhat complex. (You don’t actually have to buy the extra hardware

if you pick up a Radeon Pack edition of a Vega card, for example.) Head over to PCWorld’s RX Vega Radeon Pack explainer for a full breakdown. One crucial tidbit: It remains to be seen how much Vega stock gets allocated to stand-alone versions and how much gets set aside for Radeon Packs. Here’s what AMD says about the situation:

“We can’t break out volumes, but we’re working to ensure ample quantities of both stand-alone cards and the Radeon Packs so that gamers can get exactly what they’re looking for.”

Enough talk. Let’s benchmark!

OUR TEST SYSTEM

We tested the Radeon RX Vega 64 on PCWorld’s dedicated graphics card benchmark system. Our testbed’s loaded with high-end components to avoid bottlenecks in other parts of the system and show unfettered graphics performance. Some secondary details differ from prior reviews, however, as we’re in the process of upgrading to a more modern testing system. The case, power supply, and

SSD model have changed, but the core aspects remain the same as before, and we retested all of the cards

•    Intel’s Core i7-5960X with a Corsair Hydro Series H100i closed-loop water cooler.

•    An Asus X99 Deluxe motherboard

•    16GB of Corsair’s Vengeance LPX DDR4 memory

•    EVGA Supernova 1000 G3 power supply

•    A 500GB Samsung 850 EVO SSD

•    Corsair Crystal Series 570X case, deemed Full Nerd’s favorite case of 2016.

•    Windows 10 Pro

I’d hoped to perform more extensive testing on Radeon Vega, going so far as to prepare a Ryzen 1800X system ahead of time to provide benchmarks on both AMD- and Intel-based systems. I’d also hoped to test the cards’ hash rates for mining. Unfortunately, some hardware failures in our main test rig and an extremely tight testing window (AMD shipped the Vega cards to us painfully close to the deadline) prevented me from doing more than standard games testing. A version of Wattman that enabled Vega overclocking arrived over the weekend, so I wasn’t able to dabble in that, either.

The limited testing time and hardware failures also affected our lineup of tested graphics cards. We’re reviewing the Radeon RX Vega 56, air-cooled RX Vega 64, and liquid-cooled RX Vega 64, of course. All were benchmarked using the Balanced power profile on the stock BIOS.

We weren’t able to retest the Fury X, Vega’s HBM-packing predecessor. The card was a bit slower than the GTX 1070 when Nvidia’s card launched in May 2016.

We also retested the cards’ natural competitors, the Nvidia GeForce GTX 1070 and GTX 1080. We’re also including the reference GTX 1080 Ti, with performance results from April drivers. Our Founders Edition card suffered an early death shortly thereafter, so we weren’t able to retest it with Nvidia’s latest drivers but wanted to include the numbers as a reference point.

Because we’ve added a couple of new games to our suite for this review, we’re also including results from the PNY GTX 1080 Ti XLR8, a GTX 1080 Ti variant with a custom cooler, a slight overclock, and a very modest markup over the reference version. We try not to mix reference and custom models in reviews, but it felt warranted in this case—especially considering the liquid-cooled Vega 64’s price tag.

Each game is tested using its in-game benchmark at the mentioned graphics presets, after disabling VSync, frame rate

caps, and all GPU vendor-specific technologies—like AMD TressFX,

Nvidia GameWorks options, and FreeSync/G-Sync. Given the capabilities of these cards, we tested the Vega 64, GTX 1080, and GTX 1080 Ti at 1440p and 4K resolution. The Vega 56 and GTX 1070 were tested at 1080p, 1440p, and 4K. They’re versatile!

BENCHMARKS GALORE

The Division

The Division, a gorgeous third-person shooter/RPG that mixes elements of Destiny and Gears of War, kicks things off with Ubisoft’s Snowdrop engine. We test the game in DirectX 11 mode.

Vega 56 trounces the GTX 1070 Founders Edition by roughly 13 percent across all resolutions. Chalk that up as a solid win for AMD. The air-cooled Vega 64 and GTX 1080 Founders Edition essentially trade blows, with the liquid-cooled Vega getting a decent 7 to 9 percent uplift from its cooler temperatures and higher clock speeds. The similarly priced GTX 1080 Ti blew away all comers though, and—spoiler alert again—will continue to do so without testing.

Minimum frame rates aren’t listed in this review. We tend to mention that metric only when it’s an issue, and it wasn’t. All of these cards pump out smooth gameplay in the games we tested.

Ghost Recon: Wildlands

Next up: Ghost Recon: Wildlands, a drop-dead gorgeous and notoriously punishing game based on Ubisoft’s Anvil engine. Not even the GTX 1080 Ti put in a decent showing at Ultra graphics settings at 4K, so we dropped down to Very High, which “is targeted to high-end hardware.” It’s a game that includes some Nvidia GameWorks features, but again, we test with those disabled.

Unless you’re running a GTX 1080 Ti or are willing to reduce graphics settings below what we tested here—and for reference, dropping

down to the High preset only added 3fps of performance to the air-cooled Vega 64—this game is much better suited to 1440p than 4K. The Vega 56 draws even with the GTX 1070 at those resolutions in this Nvidia-leaning game, though the GeForce card opens the lead a bit at 1080p.

Likewise, the GTX 1080 maintains a 5 percent lead over both Vega 64 models at 4K, which only amounts to a couple of frames per second in practice. It keeps that advantage over the air-cooled Vega 56 at 1440p, though the liquid-cooled version closes the gap.

The PNY GTX 1080 Ti XLR8 still carries the performance torch, with a 32 percent performance advantage over the GTX 1080 at 4K, and 26 percent performance advantage at 1440p. The GTX 1080 Ti Founders Edition would likely be roughly 5 percent slower.

Deus Ex: Mankind Divided

Now it’s time for another graphically punishing game, but this one favors AMD hardware. Deus Ex: Mankind Divided replaces Hitman in our test suite

because its Dawn engine is based upon the Glacier Engine at Hitman’s heart. We dropped all the way down to the High graphics preset for this one and still struggled at 4K. We tested in DirectX 12, as that mode raises all performance boats regardless of which brand’s GPU sits at the heart of your graphics card.

No surprise here: AMD wins across the board. Once again, Vega 56 surpasses the GTX 1070 Founders Edition by 12 to 13 percent depending on resolution.

Vega 64 especially dominates the GTX 1080 at 1440p resolution, and the liquid-cooled version’s higher clock speeds give it a sizable 8 percent boost over the air-cooled model.

The liquid-cooled version delivers 17.5 percent more performance than the GTX 1080 Founders Edition at that resolution.

Even the overclocked, custom-cooled PNY GTX 1080 Ti XLR8 fails to come anywhere near the 60fps gold standard at 4K. The GTX 1080 Ti Founders Edition would likely be roughly 5 percent slower.

Rise of the Tomb Raider

Rise of the Tomb Raider tends to perform better on GeForce cards, on the other hand. It’s utterly gorgeous and one of the first games to receive specific optimizations for AMD’s new Ryzen processors not that it matters here.

Vega 56 manages to hang blow-for-blow with the GTX 1070 even in this best-case scenario for GeForce cards—impressive indeed. Vega 64 churns out decent frame rates of its own, but isn’t as fast as the GTX 1080 Founders Edition, even with a decent performance boost in liquid-cooled form. The gap is most noticeable with everything cranked at 1440p resolution, where the air-cooled Vega 64 lags the GTX 1080 by 15 percent. Still, Vega 64’s 90fps average is nothing to sneer at.

The GTX 1080 Ti Founders Edition

outpunches the Vega 64 liquid-cooled edition by nearly 33 percent. That is something worth raising an eyebrow over.

Far Cry Primal

Far Cry Primal is yet another Ubisoft game, but it’s powered by the latest version of the long-running and well- respected Dunia engine. We benchmark the game with the optional Ultra HD texture pack enabled for high-end cards like these.

Both the Vega 56 and Vega 64 beat Nvidia’s GeForce equivalent cards here, though the GTX 1070 manages to eke slightly ahead if you go all the way down to High settings at 1080p. That’s not a scenario you’d ever actually want to use, though.

The GTX 1080 Ti’s solid lead here makes it the only card capable of flirting with 4K/60fps.

Ashes of the Singularity

Ashes of the Singularity, running on Oxide’s custom Nitrous engine, was an early standard-bearer for DirectX 12, and many months later it’s still the premier game for

seeing what next-gen graphics technologies have to offer. Nvidia drivers have greatly improved GeForce performance in Ashes over the past several months. We test the game using the High graphics setting, as the wildly strenuous Crazy and Extreme presets aren’t reflective of real- world usage scenarios.

Vega 56 beats the GTX 1070 across the board in DirectX 12 mode. The GTX 1080 and air-cooled Vega 64 are evenly matched at 4K, with the more potent liquid-cooled version opening a 9.25 percent lead over the GeForce card. AMD’s hardware starts pulling ahead at 1440p resolution, though.

At least in DirectX 12: Nvidia’s cards trounce Vega in DirectX 11. That’s worth noting because DX12 is available only in Windows 10. Ashes is a definite victory for AMD for Windows 10 users, while Nvidia is the clear victor for everybody else-though the majority of PC gamers have migrated to Windows 10, according to the Steam hardware survey.

POWER, HEAT, NOISE, CLOCK SPEEDS

Power

We test power under load by plugging the entire system into a Watts Up meter, running the intensive Division benchmark at 4K resolution, and noting the peak power draw. Idle power is measured after sitting on the Windows desktop for three minutes with no extra programs or processes running.

AMD spent a lot of time talking up Vega’s power efficiency, but it’s clear the company really cranked on the clock speeds to bring performance in line with the GTX 1080, especially when you consider the power savings that HBM offers over traditional memory. At 347 watts of total system power draw, the air-cooled Vega 64 uses 106W more power than the GTX 1080 Founders Edition—heck, even the mightily

overclocked EVGA GTX 1080 FTW only used 248W. The liquid- cooled model draws an astonishing 402W. That’s roughly 100W more than even our overclocked GTX 1080 Ti XLR8 requires.

A silver lining for AMD?

Vega’s sky-high thirst for power makes the 60W gap between the GTX 1070 and Vega 56 look far less imposing.

While we didn’t measure it here, Radeon Chill can indeed bring down your power use and temperatures significantly— but only in the whitelisted games, and you have to enable it manually (which you should do)! Frame Rate Target Control can also help reduce GPU load. Seeing these Vega power results, it becomes more clear why AMD invested so much in power-saving software features in recent months.

Heat and noise

We test heat during the same intensive Division benchmark at a strenuous 4K resolution, by running SpeedFan in the background and noting the maximum GPU temperature once the run is over.

Despite using so much more power than the GTX 1070 Founders Edition, the Vega 56 actually runs much cooler, topping out at 66 degrees Celsius. The air-cooled Vega 56 hits the same 82-degree Celsius max as the GTX 1080 and 1080 Ti Founders Edition cards. AMD’s blower-style reference cooler gets awfully loud under load though, vapor chamber or no.

Speaking of loud, our liquid-cooled Vega 64 suffered from a buzzing coil whine when sitting on menus or the Windows desktop. It goes away in-game, but it isn’t very pleasant. The card hovers between 55 degrees Celsius and its max of 60 degrees Celsius during testing. That’s slightly warmer you’d expect from a liquid-cooled card; the older Fury X never topped 56 degrees Celsius in our benchmarks. It’s also worth noting how that 60-degree-Celsius maximum for the liquid-cooled version isn’t much chillier than the PNY GTX 1080 Ti XLR8’s triple-fan solution, and that GeForce card delivers a whole lot more performance for roughly the same price.

The Vega 56 varies between 1,474MHz and 1,312MHz steps.

Given Vega’s wild power draw, the liquid-cooled model probably would’ve been more effective with a 240mm radiator rather than the included 120mm version.

Clockspeeds

All of these cards hold their rated boost speeds pretty consistently, with

The Vega 64 usually sticks to its 1,536MHz boost speed.

The liquid-cooled Vega 64 is mostly rock solid at 1,668MHz, but it sometimes dips to 1,560MHz and spikes as high as 1,750MHz.

some slight, temporary bumps up or down in performance. Here are screenshots of Radeon Wattman graphs of each card’s performance during Deus Ex: Mankind Divided benchmark runs.

THE FREESYNC VARIABLE

During pre-launch promotions for Radeon RX Vega, AMD set up blind “taste tests” (go. pcworld.com/btt) at fan events. PC gamers got to play Battlefield 1 on 100Hz, 3440×1440 monitors, with one setup using the GTX 1080 and a G-Sync monitor, and another using Vega 64 with a similar FreeSync monitor that cost less.

“Though the Radeon RX Vega + FreeSync (left system) came out on top for most gamers, they said the differences were minimal and couldn’t really tell the difference,” AMD said in the aftermath.

A sizable chunk of AMD’s Radeon RX Vega reviewers guide is also dedicated to touting FreeSync’s benefits and cost advantage versus G-Sync, with expected performance results in games being boxed inside “FreeSync ranges” in AMD’s charts. And just in case I didn’t get it, AMD also sent along a Viewsonic XG2700-4K display so I could test FreeSync’s benefits firsthand.

It’s no wonder AMD’s beating this drum so hard. Once you’ve enjoyed the stutter- and tearing-free experience an adaptive-sync monitor provides, it’s painful to go back to a normal monitor. Heck, many Radeon 290/390/Fury-wielding enthusiasts have refused to pick up a GTX 10-series card simply because Nvidia hardware isn’t FreeSync-compatible.

As we discuss in PCWorld’s comprehensive FreeSync vs. G-Sync explainer (go.pcworld.com/fsv), FreeSync’s open nature means there are many more FreeSync monitors available than G-Sync monitors, and the AMD-friendly displays tend to cost much less. Nvidia views G-Sync as a premium add-on for premium monitors and requires display vendors to use a proprietary

Screen tearing is gross. FreeSync (and G-Sync) eliminate it.

hardware module. FreeSync is built atop the DisplayPort 1.2 adaptive sync standard, and AMD doesn’t even charge certification or licensing costs. FreeSync was made to spread far and wide, and cheaply. On Newegg right now, G-Sync monitors start at , while only two FreeSync monitors cost more than .

FreeSync indeed tends to be cheaper, but buying a FreeSync monitor requires a bit more legwork than with G-Sync due to its variability. Color accuracy isn’t certified. FreeSync monitors support adaptive sync only inside of specified refresh rate ranges, and some are awfully tiny. If you fall outside that range, tearing and stuttering returns. That’s an easy thing to do at 4K, because many 4K FreeSync monitors kick in at 40Hz, and Vega has troubles hitting a consistent 40fps in our 4K Deus Ex, Ghost Recon, and Division tests. A FreeSync feature called Low Framerate Compensation (LFC) combats the issue and behaves similarly to G-Sync’s solution, but it’s optional and a lot of monitors don’t have it. The ViewSonic monitor AMD sent along doesn’t, in fact.

Fortunately, AMD’s FreeSync page includes a Monitors tab in a chart at the bottom that lets you see the

supported FreeSync ranges of every FreeSync display before you buy. FreeSync’s price advantage can diminish on exceptionally high-end monitors. Do your homework!

BUYING ADVICE

So was the wait for Vega worthwhile? It’s complicated, made more so by the fact that cryptocurrency miners have greatly inflated today’s graphics card prices—and Nvidia’s next-gen Volta chips loom in the near future.

One thing’s for certain: The Vega 56 will be the best buy of the bunch when it launches on August 28. It runs cooler than the GTX 1070 Founders Edition and delivers more performance than Nvidia’s card in many games, hanging tight even in titles that favor GeForce hardware. Sure, it uses more power, but not remarkably so. The Vega 56 is also a huge step up over the (theoretically) 8GB Radeon RX 580 (go.pcworld.com/8gbr), delivering between 25 percent and 45 percent more performance depending on the game and resolution you’re looking at. The value of FreeSync is alluring indeed if you’re looking to get into 1440p or 1080p/144Hz gaming without breaking the bank.

Speaking of which, current street prices for GTX 1070 cards are another point in Vega 56’s favor, as the cheapest GTX 1070 currently available on Newegg is the MSI GTX 1070 Gaming, for (go.pcworld.com/470). That’s a whopping over the GTX 1070’s MSRP. Fingers crossed miners don’t similarly jack up Vega prices after launch. Considering how large the GPU die is, and how limited HBM2 production appears to be, I don’t expect there to be abundant supplies floating around to combat demand by miners and pent-up gamer demand for Vega.

The air-cooled Vega 64 is a trickier proposition now that GTX 1080 prices are finally starting to settle down around the card’s MSRP. Vega 64 trades blows with the reference GTX 1080 depending on the game you’re playing, but it uses a ton of electricity to do so. The only real reason to buy Vega 64 over a GeForce GTX 1080 is if

you plan to pair it with a FreeSync monitor for 1440p or ultrawide gaming at a high refresh rate (like the superb, hassle-free Nixeus EDG 27, or 4K gaming (often sub-60fps).

Affordable adaptive sync or vastly superior power efficiency? Pick your pleasure. There’s no wrong answer. ..unless you choose Vega and don’t get a FreeSync monitor.

We can’t recommend the liquid-cooled Vega 64 no matter how gorgeous it looks. The card’s performance results leave me very interested in seeing what overclocked Vega 64 cards with custom cooling solutions can do in the future, but at this time the liquid- cooled Vega 64 has too many strikes against it. The coil whine isn’t guaranteed to affect every unit, yet even taking that off the table, the awkward tubing, wild power draw, essentially GTX 1080-level performance, and the fact that it’s limited to a Radeon Aqua Pack edition render it undesirable for the most part. It’d be much easier to swallow if it were available in a stand-alone version for less. As-is, the GeForce GTX 1080 Ti blows it away in performance for roughly the same price.

In fact, give the Radeon Pack editions of all these cards a hard pass unless you already planned to pick up both Prey and Wolfenstein II: The New Colossus at full price, build a swanky Ryzen 7 system with a premium motherboard, or want a swanky Samsung monitor that blows away FreeSync’s value proposition) for — and all only at select retailers, as part of a single massive purchase. Again, our Radeon Pack explainer dives into the details, but the bundles don’t really make sense for most buyers the way they’re configured, and the surcharge pushes the Vega cards into the “not worth it” range unless you plan to put the extras to good use.

THE BIG PICTURE

Taking a step back, it’s great to see AMD finally return to enthusiast-class graphics cards. Dedicated FreeSync owners finally have worthy high-end gaming options to

drive their displays! Competition is back!

But it’s hard not to feel a bit let down by Vega on the gaming front.

Nvidia launched the Pascal GPU-based GTX 10-series 15 months ago, in May 2016. It’s taken AMD this long to release graphics cards that merely compete with the GTX 1070 and GTX 1080, and Vega needs a far larger die size (486mm vs. 314mm) and far more power to do even that. The Titan Xp and GTX 1080 Ti still reign comfortably supreme in performance. This is after AMD mocked Nvidia’s forthcoming Volta GPU architecture during a video revealed at CES in January, stoking hopes that Vega would be an utter beast.

Eight months later, Vega can only battle with the aging GTX 10-series, and Nvidia’s already showed off Volta in its ultimate-data­center form. Volta-based GeForce graphics cards can feasibly drop at any point and ruin Vega’s fun, though Nvidia may wait until the new year. Vega 56 and Vega 64 hold up pretty well in raw performance against Nvidia’s graphics cards today, but you have to wonder how they’ll manage when fresh Volta cards arrive.

Taking a step even further back, AMD’s Vega architecture works in important features—like FP16 and the technically stunning high-bandwidth cache controller— that seem potentially interesting for gaming in the future but designed more to earn the company a foothold in data centers and machine-learning scenarios. That’s where the real money is these days, so the focus there makes sense. Nvidia creates different GPUs for different market segments, but the much smaller AMD simply can’t afford to do so.

Radeon RX Vega ain’t bad, but it ain’t mind-blowing despite some nifty tricks, and it’s awfully late to the game. Here’s hoping its successor, Navi, will be able to push the gaming envelope in 2018…and that the wait won’t be as excruciatingly long as it’s been for Vega.

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