You should be able to coax a little better score with your current cpu clock speed and a slight gpu clockspeed increase. Based off my card here, it'll run 820 core @ between 1040mv and 1087mv with the memory running at 1050. Temps ramp up to about 75c on the flying dragon on air. You won't need much more clocks beyond that until you increase your cpu speed again. Looks like its up against the cpu bottleneck again right here at 820/1050 @ 4.2ghz:
28015marks
gtx470_3D06_28015.jpg
Doesnt get much better at 850/1025: (around 80c load temps give or take)(ran at 1087mv)
gtx470_.JPG
acebook
Threaded Mode