I've got a user that everytime they boot their machine, every fan in the chassy spins very fast(thus loud). Right after posting the fans start to slow down, and become stable about the time windows loads.
SuperMicro® intel® Tylersburg 5500/5520 C.S. X8DAi Serverboard
2x Quad-Core Intel® Xeon® E5630 2.53GHz-12MB Shared L3
CoolerMaster 1200W Silent Pro Gold
nVidia, Quadro FX 2000