i have the same temperature as you do with stock cooling.
but i have set the voltage to 1.18v, everything else untouch
now i use AC Freezer 7 Pro, currently at 430x9 @ 1.225v fsb, dram +0.1
everything else untouch.
Honestly, I didn't see anything faster, no only that, the load time of windows takes way longer than before. Now just the numbers are higher than originaly.
I believe once i reinstall windows, the loadtime problem will go away. but i will wait till i get a new video card first.