I'm building a PC for a friend, which includes an AMD 64 3500+ processor on a DFI Lanparty UT nF4 SLI-D motherboard. Also running a BFG 7800GT video card (just one for now) and a couple of SATA drives. This is the first time I've worked with an AMD processor, and I've noticed a few times that when I start up the system, the fan over the CPU heatsink is running, but once I get close to loading Windows, it will stop for a while. According to the hardware monitor software that came with the motherboard, when the PC is relatively idle, the CPU temp is around 26C. That seems pretty cool compared to my P4. My question is, do AMD chips and/or motherboards manage the CPU fan so it's not running below a certain temperature? Just trying to figure out if I should be wary of this behavior. Thanks in advance!