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Somehow I suffered through an extended session of Quake 4, after which I popped out to the desktop and found GPU temps of 89°C for GPU 1 and 85°C for GPU 2—much better than on the open-air test bench. I also did some additional testing by running a graphics demo in a window on the desktop as I worked one morning. The demo didn't take advantage of SLI, so only one GPU was active, but its temperature climbed slowly to as high as 102°C before reaching an apparent equilibrium and staying within the 100-102°C range.
Originally posted by C0bzz
I wouldn't bother with upping the fan. The cards are designed for it. I've had my X850XTPE upto and over 115 Degrees Celcius, heavy gaming for two years. No artifacts, no problems (that were heat related). It's now in another computer and cooking itself away in there.
8800GT would sound like a hair dryer with the fans increased. Aslong as it's under 90 degrees I'd be happy. If the fan stays at 30% and gets above 90 you may have a problem with a crappy BIOS for early 8800GTs where the fan is STUCK at 30%.
[edit on 23/6/2008 by C0bzz]
The rule of thumb to remember is that the more computing power your PC has, the more heat it will generate.
What you need to know is that hot components can fail and ultimately wear out much faster than components cooled to reasonable temperatures. To keep your system running well, you have to watch the temperature.