I had a few lockups with my 8800GT, so after doing some searching on various websites and forums it seems that there might be a bug in the drivers when it comes to the 8800GT. The fan doesn't spin up under load, hence the temperatures hit such high levels.
When I loaded up Rivatuner or nTune, it said that fan speed was set to auto. However, this meant it was set to 29% regardless of the type of work it was doing i.e. 2D/3D or temperature.
I changed the fan speed to manual and set it to 45%, still quiet, but much better cooling. Anything above 45% was quiet noisey. Temp changes were as follows:
Stock fan speed (29%):
Idle 53c
Load 90c
Fan speed 45%
Idle 48c
Load 69c
As you can see, a massive difference (-5c idle and -21c at load), for only a small increase in noise. Just adjust the percentage to find the best cooling/noise ratio for you. I dont get any lockups at all now.
Reading around forums, people seem to think that their cards may have died due to heat and others have had consistent crashing when doing 3D work due to high temps.


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