after trying "gsupp's" settings im getting a stable 580khs, only run for a few mins, but looks like im on the right track, I think the 7970 is going to be even more difficult to tune tho

EDIT: only settings I change from gsupp's setup was 1250mhz mem and 1100mhz gpu. my 7950 really doesnt like going over 1250mhz ram for mining

getting 590khs with these settings

"intensity" : "20",
"vectors" : "1",
"worksize" : "256",
"kernel" : "scrypt",
"lookup-gap" : "0",
"thread-concurrency" : "40960",
"shaders" : "0",
"gpu-engine" : "1100",
"gpu-fan" : "65-65",
"gpu-memclock" : "1250",
"gpu-memdiff" : "0",
"gpu-powertune" : "20",
"gpu-vddc" : "1.175",
"temp-cutoff" : "92",
"temp-overheat" : "86",
"temp-target" : "80",
"api-mcast-port" : "4028",
"api-port" : "4028",
"expiry" : "120",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "30",
"scrypt" : true,
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"