The temps look a little high but I'm sure the shaders can be clocked higher. Probably high enough to get over 1900 PPD. The shaders on my 8800 GT cards are all OC to 1752MHz, but my systems are run with their cases open. If you can provide additional cooling, you'll probably able to get a better OC while alleviating some of your concerns.FWIW, I'm getting about the same ppd on my 8600gt, and that's while running the Windoze SMP client in the background, plus whatever SWMBO and my 4 year old throw at it while I'm at work... I usually rate 1800ppd on the GPU client and 600-650ppd on the SMP client for about 2400-2450ppd total. I'm personally afraid to crank my card any higher than the 620/800 it came OC'd at from XFX, because with the GPU client running wide open, it's reading 96-98 degrees C, and that just can't be good - glad it has that double lifetime warranty!