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Wanting a quiet computer, I replaced rather noisy default heatsink & fan on my Asus GeForce 6800XT with Thermaltake Schooner.

The installation took about an hour because the instructions were somewhat misleading, some of the screws were too long, and my hands are shaky. I got it installed properly nonetheless.

In my opinion, the performance is great for a completely passive cooler.

The manual says overclocking isn't recommended (of course), but I've overclocked core 20% and memory 10%, and unlocked 16 pipes and 5 shader units (default for the card is 8 pipes & 4 shaders).

This is what the temperatures look like after running 3DMark06 default test with the case closed:





Although the temperatures may seem high to some of you, the system is stable. GPUs can handle the temperature better than CPUs anyhow, from what I can tell.

Next I need to get rid of CPU and PSU fans, they're the only ones left.

High temps are usually the main problem of fried (and ready to eat) boards. I suppose if the temps aren't much higher than with the stock cooler, you should be fine.