Originally Posted by papyrichter
I haven't been able to set it any lower than 33% using Speedfan, Trixx, etc. I think that's the lowest it will go. Although the fans are near silent at 33% (~1380 RPM), they're not entirely silent. And at load with the fans ramped up to 50% they're noticeable. Right now I'm experimenting with undervolting at stock speeds (925/1250) to see if I can keep the fans at 33% in demanding games (using a tweaked fan profile). So far it's looking promising.
If you're looking for a "silent" card I would recommend the PCS+ 7950, which Newegg currently has for $229 after rebate.
After playing around some more, I've decided the fans are very quiet at 1380 RPMs. In my system, they're adding less noise than my HD (1TB Samsung), my PSU (CX500), or my CPU fan (stock Hyper 212+) - all at idle. I also noticed that the fans on the card spin down completely when the monitor goes blank in powersave mode, yet I don't notice any decrease in system sound.
I've also done some experimenting with custom fan profiles in TRIXX. I've set the fan curve at the lowest setting (1380 RPM) from 0-75C, and then start to increase it in a straight line from 30% to 100% between 75-90C. So far I've been able to keep the fans at 1380 RPMs during 45 min of gaming; the card stays at 75C or less at 925/1300 at 0.988V (reads as 1.01V in TRIXX). When running 1100/1500 (roughly 7970 GHZ speeds) at 1.11V (reads as 1.14V in TRIXX) the fans ramp up to 1900 RPMs at around 78C, which is still reasonably quiet.
I don't see any reason to run these cards at 65C when the system is much more quiet by allowing the card to get up to 75-78C - which is well within limits.Edited by papyrichter - 8/23/13 at 7:15am