I think some cards are just not as good as others.
I have the Sapphire 3gb 7950 and the most I can get regularly is 560Kh/s at i-18. People always claim to get over 600 but I have yet to get over 600 using countless settings. I think it is a matter of silicon lottery.
With adequate cooling, i am able to achieve 715KH/s on the outside card. The inside card is currently not on a riser, and doesn't have room to ventilate due to the card on the outer most 16x PCI-E slot. So I have it at -I 12 whilst the outer card is at -I 20. Both run flawlessly with out a single HW error. Thanks again for the tips everyone. Once I have all four cards mounted with risers/powered risers for both 16x, I will have each card running at 715KH/s+ for a total hashing power of 2,860KH/s.
No, my cards are not 7970s!
They are 7950s. I have no idea why I'm able to achieve such an amazing hash rate. The only thing I can think would be the fact that I am using 12.8 AMD drivers and 2.7 SDK drivers.
What is your cgminer settings for the 715KH/s card?
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