Gigabyte R9 270 OC - Stable 480kh/s with <1% of rejects - cgminer

"api-listen" : true,
"intensity" : "19",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"auto-fan" : true,
"temp-cutoff" : "85",
"temp-overheat" : "75",
"temp-target" : "70",
"lookup-gap" : "2",
"gpu-fan" : "60",
"expiry" : "30",
"gpu-dyninterval" : "7",
"log" : "5",
"queue" : "1",
"retry-pause" : "5",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"thread-concurrency" : "21568",
"gpu-thread" : "1",
"gpu-engine" : "1125",
"sharethreads" : "32",
"gpu-memclock" : "1470",
"no-submit-stale" : true


On higher clocks one of my cards is sick so lower are more stable for me.