I've got a pair of high CFM Panaflo 80mms at about mid speed (halfway on a Vantec controller) - barely audible, but pulling a nice cool breeze in the front and throwing a nice warm one out the back. Other fans are PSU fan (variable based on PSU temp), a CNPS6000-b Cu at 2700RPM, and a VF900 at full speed too. Pretty quiet rig. My 2.6Ghz 3000+ tops out at about 48-49C load. I've got my 7900GT at 575/1720 and haven't seen crashes, but I haven't done any volt modding or really pushed it hard enough to know if it's 100% stable or not. I'll do that this winter when I have more computer time.