The test system with the XFX GeForce 8800 GTS 512MB installed is pictured below.
XFX GeForce 8800 GTS 512MB Installed
As expected, GPU temperatures were noticeably lower than the GeForce 8800 GT. Idle temperature was 54° C while a peak temperature of 66° C was reached under load with the fan speed at the default of 50%. Fan noise became noticeable at 62%, where the temperature leveled off at 63° C.