First 2 280X are Saphire Toxic 280X
and the 3rd 280X is Asus DC2 280X
the 4th is PowerColor 290X
I am getting a hashrate between 780-800Kh/s from all the 3 280X cards
and between 750-800 for 290X card
"intensity" : "13,13,13,20",
"vectors" : "1,1.1,1",
"worksize" : "256,256,256,256",
"kernel" : "scrypt,scrypt,scrypt,scrypt",
"lookup-gap" : "2,2,2,2",
"thread-concurrency" : "8192,8192,8192,25400",
"shaders" : "0,0,0,0",
"gpu-engine" : "1160,1160,1160,947",
"gpu-fan" : "85,85,85,85",
"gpu-memclock" : "1800,1800,1800,1250",
"gpu-memdiff" : "0,0,0,0",
"gpu-powertune" : "20,20,20,-20",
"gpu-vddc" : "0,0,0,0",
"temp-cutoff" : "95,95,95,95",
"temp-overheat" : "0,0,0,0",
"temp-target" : "0,0,0,0",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "2",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"device" : "0-3",
"kernel-path" : "/usr/local/bin"
}