R9 270 (non x)
2.7 Mhs / each (6 gpu farm running 16.2 MHs)
Ubuntu 64bit
sgminer-sph ( https://github.com/djm34/sph-sgminer_x11mod )
AMD 14.6 drivers (beta)
*edit, not RC2 -- but posted as a reference/comparison
"kernel" : "x11mod",
"intensity" : "18",
"worksize" : "64",
"lookup-gap" : "2",
"thread-concurrency" : "8193",
"gpu-threads" : "2",
"gpu-engine" : "950-1115",
"gpu-fan" : "0-85,0-85,0-85,0-85,0-85,0-85",
"gpu-memclock" : "1485",
"gpu-powertune" : "20",
"temp-cutoff" : "88",
"temp-overheat" : "85",
"temp-target" : "63",
"api-listen" : true,
"api-mcast-port" : "4028",
"api-port" : "4028",
"auto-fan" : true,
"expiry" : "30",
"failover-switch-delay" : "60",
"log" : "5",
"no-pool-disable" : true,
"queue" : "2",
"scan-time" : "30",
"shares" : "0",
"load-balance" : true,
"kernel-path" : "/usr/local/bin",
"api-allow" : "W:127.0.0.1"
}