Just wanted to report this very easy fix to my gtx460 to make it less noisy
http://i.imgur.com/ZkR9j.jpg
I removed the 80mm fan and replaced it with a 120 fan at 5v. The card performs incredibly well, I registered 26C in idle and 38C under stress (21 ambient). It was 33C-45C with the stock fan and noise definitely reduced by a good amount.
Note that I also changed the thermal paste on the gpu.
http://i.imgur.com/Wp8QV.jpg
the board is a msi cyclone gtx 460 but I bet can be applied to any GPU.
Modded gtx460
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