I'm running 5x Gigabyte R9 290 at 854kh/s each (
http://dump.chiko.nl/g/09fbac.png ) using sgminer with linux (Litecoin BAMT) and 1GB of RAM.
My suggestion: lose windows.
Settings:
"intensity" : "20",
"vectors" : "1",
"worksize" : "512",
"auto-fan" : true,
"temp-cutoff" : "90",
"temp-overheat" : "80",
"temp-target" : "75",
"gpu-dyninterval" : "7",
"scan-time": "1",
"expiry": "1",
"shares": "0",
"queue" : "1",
"retry-pause" : "5",
"scan-time" : "30",
"temp-hysteresis" : "3",
"shaders" : "2816",
"thread-concurrency" : "24550",
"gpu-powertune" : "18",
"gpu-thread" : "1",
"sharethreads" : "32",
"lookup-gap" : "2",
"gpu-vddc" : "1.000",
"gpu-engine" : "950",
"gpu-memclock" : "1500"
