Hey guys, I'm using win7 x64 ultimate, with 4x r9 390 and I'm seeing alot of fluctuations while mining, 117mh is the standard but once or twice a minute it drops to 90mh, 110mh, all cards at once drop from 29 to 22-25. I don't see any high cpu usage spikes, not sure what is causing it, have 2x750W SF psus, total consumption is at or below 1300W from wall meter. So I tried to disable all tasks and services, I'm just not sure if there's anything I'm missing. I'm using claymore 5.3 dualmining. Temps are about 70-80C, highest 82C afternoon. The fluctuations are not so visible in claymore logs because usually they happen just for 4-5seconds and I can only see them in ethman. Is this normal or something is wrong with my rig? My other rig 4x r9 280x has alot less of these hashrate drops and usually only one card is dropping, maybe every 5minutes all of them drop 10-15% for a few seconds but the r9 390 rig can drop even for 20sec down to 80mh..85mh...117...90...95...then back 117 stable.
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