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March 22, 2013, 01:32:42 PM |
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I rig with Asrock 970 extreme4. pcie1 1x 5870 on extender 1x->16x, pcie2 1x7950, pcie3 1 x5850-on extender 1x->16x and pcie5 1 x 5970 all powered by and AX 1200 W.
Problem: I start cgminer/phoenix -anything is the same- and gpu usage is at 98-99% but the usage is dropping down on all gpus by time.For example all gpus drop from 98-99 % to 95% in 1 h, so like 3-4 % / h down loosing this way my hash power.
Untill I added the 7950 never experienced such a problem with the other 5xxx.I suspect a driver problem as I also noticed spikes in cpu usage as well, but I tried all drivers from 12.3 to beta 13.3 with all sdks from 2.4 to 2.8 in vain .
Power is NOT an issue here as they all suck max 850 W according to my power meter.
OC is also not an issue as same thing is happening regardless of OC.
Temps between 58-65, so heat is not an issue.
Priority of cgminer is set to realtime and monitored gpu load via gpu-z and MSI AB.
Any suggestions?
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