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Title: GPU overclocking and core clock fluctuations and mem ratio Post by: trueimage on June 04, 2011, 03:25:42 AM Hi, just got 2x 6950 2GB already flashed to 6970 unlocked shaders
I am running GUIMiner with flags -v -w128 -f 0 I am running drivers 11.5b Win 7 x64 Stock speeds on these cards are 800 / 1250 I've got two copies of GPU-Z running and they show a solid 800 mhz, 99% load, 1.1000 V I installed MSI Afterburner, and the max it allows me for clock is 840, so I set it to this and tried every voltage up to 1.2000 V The problem is that the clock speed fluctuates in GPU-Z down to 792 MHz and back up to 840 and a few in between. Is this because there is not enough voltage to keep it at 840 under 99% load? I bought these from a friend and he had them under water cooling at 925 / 1250 @ 1.3v Ok also, I've read a few posts about memory speed doesn't matter so clock it down to save power / heat / etc. And I've read references to using a ratio gpu : mem clock. Any tips on this? Cheers. Title: Re: GPU overclocking and core clock fluctuations and mem ratio Post by: gigabytecoin on June 04, 2011, 07:22:07 AM If you can underclock the mem to 300mhz... you can probably squeeze 950mhz out of the core! Good luck!
Title: Re: GPU overclocking and core clock fluctuations and mem ratio Post by: accod on June 04, 2011, 07:51:21 AM Open CCC and in the Performance section set the Power Control to +20%. That should stop the fluctuations.
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