Originally Posted by SOCOM_HERO
HIS may have its own overclocking utility, but I am not familiar with it. Regardless of whether they make their own or not, I would download MSI Afterburner as it has never failed me for GPU OCing.
Shoot for core clock bumps of 10-15mhz at a time at first, stability test with Unengine Heaven or Valley for many runs, then increase the core by the 10-15Mhz margin until you notice stability issues. Bump voltage bit by bit and test some more, make sure to monitor temps with each voltage increase and do not allow the card to exceed 90C in a benchmark as that is a sign that your volts are approaching too many (rises in temp). I would also recommend testing with Futuremark's 3DMark 11 and 3D Mark in the Firestrike preset. Max everything out that you wish in all the benches.
Furmark for stress testing is a stretch and really places a hyper-unrealistic threashold on the cards thermals and I find it useless for gaming, but once you think you have things really tuned in, then go for it as a last resort temperature test.
Finally, test these settings in your favorite games, play the most intensive levels or areas of the map where performance is struggling or FPS drops. If the game crashes, you will need to back off and fine tune your core and voltages. I recommend using 5Mhz decreases here.
Pro Tip: If you don't care about a power bill or power savings while gaming/stressing the GPU, then crank the power limit slider to max in Afterburner to stop core frequency throttling during benchmarks. You can back it off if you wish to be more energy efficient, but this is OCN...
For day to day use, I like to keep my temps in the low 60C under gaming load at most and do not run my max overclock on my 7950. Instead I keep it about 100MHz below and a good .2V below my max. That will improve stability and longevity of the card.