Hello,
I tried everything, but it seems that my two Sapphire Tri-X R9 290 couldn't be underclocked below the default values - GPU Core - 1000 MHz, Memory - 1300 Mhz - I set for example GPU core at 947 and Memory at 1250, but when I look in GPU-Z (latest version) I see that the default values are shown and the change haven't been applied. I tried setting this in CGMiner 3.7.2, SGMiner and with Afterburner. I can set a higher clocks (like 1080/1500, or 1060/1499), but then the driver keeps failing and only the second GPU is actually working (at around 950 MH/s) and the first one isn't mining at all.
For the moment they are both stable in the same time only at default clocks (1000/1300) where I get 882KH/s per GPU.
I've tried to tick the jumpers on the cards, but the system haven't even start, so I've reverted back the change.
I am using 8 GB ram, Win7x64, Catalyst v13.12. My SGMiner config is the following:
"intensity" : "21,21",
"gpu-threads" : "1",
"vectors" : "1,1",
"worksize" : "512,512",
"lookup-gap" : "2",
"thread-concurrency" : "32765,32765",
"shaders" : "0,0",
"gpu-fan" : "50-85,50-85",
"gpu-memdiff" : "0,0",
"gpu-powertune" : "20,20",
"temp-cutoff" : "92,92",
"temp-overheat" : "85,85",
"temp-target" : "72,70",
"auto-fan" : true,
"log" : "5",
"no-pool-disable" : true,
"scan-time" : "60",
"kernel-path" : "/usr/local/bin"
}