whats your setting for 4.2mh/s?
"no-restart" : true,
"failover-only" : true,
"failover-switch-delay" : "60",
"api-listen" : true,
"api-port" : "4028",
"api-allow" : "W:127.0.0.1,R:0/0",
"xintensity" : "700",
"worksize" : "128,128",
"kernel" : "x11mod,x11mod",
"auto-fan" : true,
"temp-cutoff" : "81",
"temp-overheat" : "76",
"temp-target" : "71",
"temp-hysteresis" : "3",
"expiry" : "1",
"gpu-dyninterval" : "7",
"queue" : "0",
"scan-time" : "1",
"shaders" : "2560",
"thread-concurrency" : "25600",
"gpu-threads" : "5",
"lookup-gap" : "2"
NRD has some nice settings too, on page 41.
1050/1500 set with MSI AB, AMD 14.3beta, Win 8.1. Kindly read the last 2 pages of this thread as there was quite a debate about how/where to set the clocks and other miner params.