Rrunning 280x MSI Gaming @ 2.25 MH:

"intensity" : "13
"lookup-gap" : "1",
"gpu-threads" : "2",
"gpu-engine" : "1150-1150",
"auto-fan" : true,
"gpu-fan" : "0-85",
"gpu-memclock" : "1500",
"gpu-powertune" : "20",
"temp-cutoff" : "95",
"temp-overheat" : "85",
"temp-target" : "80",
"temp-hysteresis" : "3",
"vectors" : "1",
"kernel" : "darkcoin"