GTX 480 is hot. Get GTX 570 instead. GTX 480 is running between 85 C to 92C(cooking machine). 92C fan speed is at 3000 RPM( loud)
GTX 5xx series use new cooling system call Vapor-Chamber Cooling . temperature between 38 c idle to 69 C. 69C fan speed is at 1300.
Your room gonna be hot if you use gtx 480
check this video . http://www.youtube.com/watch?v=GAbaOrnV2Ag