Unlike CPU overclocking, we need to download some proprietary software to use within Windows. It’s usually most beneficial to download whichever manufacturer’s software your card’s PCB is based upon. GPU Tweak for Asus, Afterburner for MSI, and so on. In this case, we’re using a reference cooler on our GTX 980, so we’re using MSI’s Afterburner. It provides frame monitoring for benchmarking, a customisable display and in-game overlays to monitor how the cards perform compared to their stock speeds.Once Afterburner is installed, the first thing we want to do is enable ingame overlay, and frame rate monitoring, followed by (for us at least) changing the skin to something a little more workable.Next you’ll want to get a clear understanding of how your card performs at stock speeds. We’re using Total War: Rome II’s benchmarking software at max settings at 2560 x 1440. We achieved a minimum frame rate of 19, a max of 61, and more importantly an average of 44.7.We now need to get into the overclocking side of things. Head back to desktop and open up MSI Afterburner again. The first thing we’re going to increase is the power limit. Move the slider to as high as it will go. This should allow our card to use absolutely every inch of power we can get, beyond Nvidia’s recommended stock settings, meaning the card can run all the way up to 91 degrees Celsius, as opposed to the stock 79°C.Start by increasing the clockspeed. Research what’s most suitable for your card. In our case, a healthy overclock for the core clock should be an extra 225–275MHz offset, so we go for 240MHz.Lastly, we’re going to increase the memory clockspeed. After research, we can see the community, on average, is aiming for around 450MHz. We’ll try that and see how it goes, leaving Nvidia’s GPU Boost to calculate exactly how much voltage we need. All that’s left to do is press ‘Apply’ and go back into the benchmark to see how the card performs.In the Total War: Rome II benchmark, we achieved a minimum frame rate of 17 at overclock, a maximum of 67, and more importantly an average of 53.6, an increase of almost 9fps towards that average. Granted, the delta between the minimum and the average is considerably greater than the stockclocked version, but who can argue with free performance?