No offense, but this is the worst advice in this thread. Several reasons. The GTX 400 series are already fairly power hungry. First of all, you decrease the life of your card by putting unnecessary strain on the fan. Running your fan full-speed during gaming increases your power consumption as well. Even if you have money to burn, the decibel level pumped out by twin GTX 480s blowing full blast is ridiculous. Too much even if you're playing a flight sim :P
There's about 100 threads out there on over clocker forums about fans running at 100%, sure it will drain a touch more power, it will definitely not kill off your card much faster. Your card will probably be obsolete by the time the fan dies. I have yet to have a video card die on me from running a fan at 100% on certain games. I'm not saying ALL games need this, FFXIV for sure does at times, but other games, no. Now cards dying from over heating? Ya, I've seen that happen many times.
Of course for the noise level, running at 100% isn't optimal, but if your case can't handle it right now and you're shutting down from overheating, I'd rather have my fan go at 100% and take off 1 year of my cards life (from the 10 it'll probably last), then to have everything getting over heated. My GTX 460 isn't even that loud, especially compared to older cards. http://www.overclock.net/nvidia/663389-bad-run-my-gpus-fans-100-a-2.html http://www.neoseeker.com/forums/17/t1388163-rivatuner-gpu-fan-speeds-also-cpu-fan-speed/
And these are just a couple threads showing the fan at 100% during certain things might actually increase it's lifespan. I agree 100% about the noise though. Edited, Aug 25th 2011 8:28pm by Montsegurnephcreep