I just got a 2.8 refurbished Quad and it's not loud, but it definitely has some fan noise. Coming from a quiet iMac, its annoying. So I did some reading and installed SMC fan control. I bumped the intake and exhaust from 600 to 800 and it seems so much better and runs a lot cooler too. Will it cause any harm in the long run? What do you guys set your fans at? I'm a noob at the Mac Pro and want it to last many years. Thanks