I have a Sapphire Tri-X 290x with stock bios, using sgminer 4.1.0. I have terrible case cooling -- don't ask.
I'm unable to get 950+ at any settings. I can push 900k but the temps go over 90cGPU/100cVRM. I tried memclk 1500 and it worked for awhile then started crashing hard.
I found I can drop GPU Engine down to 875/1250mem and still get about 830khs with 75cGPU/80cVRM at 85% fan, but I'm still not sure how to tweak the settings for this. Shooting 5 variables in the dark at an interation speed of once per 5minutes to let it stabilize, not fun.
So I'm sure these settings are not optimal but I could use help figuring out what to change.
My #1 priority is low temp and 85% fan max.
{
"xintensity" : "372",
"vectors" : "1",
"worksize" : "256",
"lookup-gap" : "2",
"thread-concurrency" : "22529",
"shaders" : "2816",
"gpu-engine" : "875",
"gpu-fan" : "60-85",
"gpu-memclock" : "1250",
"gpu-memdiff" : "0",
"gpu-powertune" : "0",
"gpu-threads" : "2",
"gpu-vddc" : "0.000",
"temp-cutoff" : "90",
"temp-overheat" : "85",
"temp-target" : "80",
"expiry" : "1",
"gpu-dyninterval" : "7",
"gpu-platform" : "1",
"log" : "5",
"no-pool-disable" : true,
"queue" : "0",
"scan-time" : "1",
"tcp-keepalive" : "30",
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}