Have you tried voltage tweaking in Asus SmartDoctor? I have this same card, and have been able to mess with voltages quite readily.
While I realize what I'm saying ain't exactly politically correct,
I'm running a serious bitcoin mining operation here, not some windows based bsod-powerhouse
Thanks anyway Electricbees, you've made a valid point.
Tried messing around with the bios using RBE but nothing good came of that, just a bit of time wasted.
Anyhow, the ASUS it not THAT bad of a 6950... a half decent choice owing to an efficient cooler.
EDIT: Bees, is it the 1GB or 2 GB version that you have? Since a large amount of ram on a gpu is actually a downside when mining is concerned, I'm guessing the 1GB version?
I have the 1GB version. I assume the 2GB version performs a bit differently than mine. Funny that you mention, as my mining rigs have been nothing but pain thanks to the Win7 operating system. Pretty universal, I guess?
I've been using GUIminer for my rigs, which run windows, and have not ventured to any other programs besides poclbm. I can manage about 400MHash/s on the 6950 with the clocks revved up to 980mHz gpu, and mem down to about 780mHz with arguments giving me the best speed overall -v -w128. (I feel this card is sub-quality compared to most Asus 6950's, but that may just be me.) If you aren't using poclbm/gui, this is of no use, I'm sure. But I'm going to keep it relevant and post my two bits.