PSU voltage

Lately, my PSU is very loud and I can't stand the damn thing anymore. I've read about connecting the fan cable to the 5v source instead of 12v, but I'm not entirely convinced about that... What does /tech/ thinks? Yay or nay?

>>1
As for overheating, I think it's safe if your computer isn't an overclocked heap of circuitry... however, I don't know if 5V is enough the fire up the fan. It's not the air resistance, the electricity need to overpower the motor's magnets - See: http://electronics.howstuffworks.com/brushless-motor.htm

I once pealed the wires on an old one, and tried them on batteries. Took 7,5V to get the thing to spin. But try it, if it spins it spins. But if it's quiet you want, migth just be a better idea to purchase a new quiter PSU.