I have 2 cards. 1 msi 280x gaming and 1 gigabyte 280x v2. The rig has 4gb of ram.
These are the settings I've used under windows 7, which have given me roughly 350 kh/s per card:
,
"vectors" : "1,1",
"queue" : "0",
"expiry" : "30",
"scan-time" : "1",
"worksize" : "256,256",
"intensity" : "13,13",
"gpu-threads" : "2",
"lookup-gap" : "2,2",
"gpu-powertune" : "-20,-20",
"auto-fan" : true,
"gpu-fan" : "25-90",
"temp-target" : "75,75",
"temp-overheat" : "85,85",
"temp-cutoff" : "90,90",
"gpu-memclock" : "1500,1500",
"gpu-engine" : "1030,1015",
"thread-concurrency" : "8193,8193",
Now I've installed windows 8.1 in my rig, and i get a ton of HW. Tried tweaking alot of settings, but the only thing working is lowering intensity to 12, but then i only get aroun 270 kh/s per card. Not really acceptable.
Anyone know why this happened? And any solution?