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Overclocking Sapphire HD 7950

I have Sapphire HD 7950 in my rig, and I wish to overclock it. I've tried before using MSI afterburner, but I've had problems when testing for stability. I've tried both MSI Kombuster and Furmark, but even when I put the core clock to 1250 MHz, I wasn't seeing any problems when running either. My temperatures stayed in the 60's C, which it did at stock anyways.

Basically, I have two questions:

1) How do I effectively test the card's stability?

2) Would it be worth it to change the voltage? (I have a 650W Corsair PSU and i5 3570k @ 4.5 GHz, power shouldn't be an issue)
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More about overclocking sapphire 7950
  1. Best answer
    This topic has been moved from the section Graphics & Displays to section Overclocking by Mousemonkey
  2. Thanks!

    Anyway, what would be the best way to test the stability? Do I just need to run something like furmark for several hours?
  3. Best answer selected by morgoth780.
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