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How do you overclock 7950s?

post #1 of 9
Thread Starter 
Hey guys,

would you OC via CCC? If so how much of a performance gain would there be for a minor OC?
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post #2 of 9
http://www.guru3d.com/article/radeon-hd-7950-overclock-guide/

/thread
post #3 of 9
Thread Starter 
Thanks for the link thumb.gif

It was saying that to OC you should incriments of 25mhz increase. How would you test to make sure its stable? Just play lots of BF3? lol
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post #4 of 9
Quote:
Originally Posted by C6ZR1 View Post

Thanks for the link thumb.gif
It was saying that to OC you should incriments of 25mhz increase. How would you test to make sure its stable? Just play lots of BF3? lol

Download MSI Afterburner/Kombuster. Use Afterburner to OC your GPUS. To test stability, run Kombuster's GPU burn-in test. Watch for artifacts (small pixellated squares that pop up and corrupt the image when an OC is unstable). Gradually increase clock speeds until you see artifacting, then dial the clocks back down to the last good config.

You can get both programs here: http://event.msi.com/vga/afterburner/download.htm

I believe Kombuster comes packaged with Afterburner, but if not just Google it.
post #5 of 9
Thread Starter 
Would increasing the memory and gpu clock in 25mhz be a safe route to go? Also, how long should I run the tests for?
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post #6 of 9
keep the memory at stock for starters until you get a feel for what you can run the core at. after you find the core limit then start upping the memory.
post #7 of 9
Thread Starter 
1)My card is stock OC'd at 900mhz, should I increase at a steady 25mhz?
2) How long should I stress test it?
3) What would you consider to be the limit when upping the core w/o any voltage tweaks?
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post #8 of 9
Quote:
Originally Posted by C6ZR1 View Post

1)My card is stock OC'd at 900mhz, should I increase at a steady 25mhz?
2) How long should I stress test it?
3) What would you consider to be the limit when upping the core w/o any voltage tweaks?

I don't have a 7950 so I don't know how high it can go, but the usual procedure for increasing core clock is to bump it up incrementally (25mhz is fine), then run Kombuster burn-in (make sure it's the extreme GPU burn-in test) for about 3-5 mins. If your OC is unstable, you'll see artifacting in minutes if you're running the extreme burn-in test.
post #9 of 9
Thread Starter 
Just finished doing kombustor with these settings

260

Worked perfectly fine. Guess I now have clock speeds equal to reference 7970s biggrin.gif

Thnx for the tips
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