4x Asus r9 280x dc2 for a total hashrate of 12.66Mh/s

Power consumtion of 560W at wall (kill-a-wat measured). All GPUs undervolted using MSI Afterburner (two at 1,056V and two at 1,075V).

All cards at 1.070 Core clock and 1.500 memory clock

Temps between 44º and 47ºC (room temp 21ºC) with fixed 50% fan speed

My settings are:

"api-allow" : "W:127.0.0.1",
"api-listen" : true,
"expiry" : "1",
"failover-only" : true,
"queue" : "1",
"scan-time" : "1",
"intensity" : "18",
"vector" : "1",
"worksize" : "256",
"kernel" : "x11mod",
"thread-concurrency" : "8192",
"lookup-gap" : "2",
"failover-switch-delay" : "10",
"gpu-threads" : "2"