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May 01, 2013, 01:36:50 AM |
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I purchased 2 identical sapphire 7950 cards from Newegg, the 4L version. I am able to run litecoin on one at 670 k/hash at 1125/1825 when I set the other card at identical value it gets 550 k/hash. I am very confused because they should be much closer. At stock clock/memory 925/1250 both run around 500 k/hash, so with the full range of OC I get 170 k/hash one one (awesome) and 50 k/hash on the other (sucks ballz). I know it could just be luck of the draw and to be honest I run the bad one at 860/1080 900vdc so it makes 500 k/hash on about 145watts which is great from an efficiency standpoint. I did notice one thing that was unusual, the "bad" card has 1.25vdc stock and the good one is 1.168vdc. Whenever I overreach with OC these are what values the cards default back to. So while they are identical, they have different stock voltages and hash very differently.
Anyone able to shed light on this? Should I RMA the bad card, I could make the argument with Newegg that if I order 2 identical cards they should be identical in their stock voltages, etc. I dont have an issue with the card and will keep it in an efficient rig if this is just luck of the draw so to speak.
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