Overclocking an AMD GPU is about as simple as it can get. I simply used Catalyst Control Center to raise the GPU and memory clock speeds using the sliders. As with any overclocking using CCC, the PowerTune slider was slammed all the way to the maximum of +20%. With such high stock clocks, it wasn't easy to push the card much further – maxing out the sliders was definitely not as good an option as you might do with lower factory-clocked cards. It was pretty easy to push the card up to 1000/1250 and run fully stable.



Link: OCC