Hey everyone - recently got a DC 2.3 G5 with a 7800GT (!!). Haven't had much time to play with it, but threw Leopard and Tiger on it this weekend and noticed 2 things: I love these machines. The fans on this thing are ridiculously loud - even compared to my 2003 G5 (and seemingly louder than the 2.7 I sold) I checked out iStat, and the problem seems to be that my backside, expansion slot, and drive bay fans are stuck at a constant rpm and creating the noise. Tried the ASD and Thermal Calibration tools - no failures, no issues, but these fans still loud / stuck at the same values. My question: Is this related to the 7800GT? It doesn't seem like it's running hot, but then again I'm not sure what a baseline would be here. Maybe somebody who has more experience with high end graphics cards of this era can help me out.