The idle temperatures were measured about 30 minutes after booting up Windows Vista. In these 30 minutes the CPU was just idling, and all services that might put a load on the CPU were turned off. The load tests were conducted using Prime95, measuring the maximum temperature after that time frame.
Not surprisingly, the temperature using two fans without any speed limits was the lowest one. The temperature reported was 21° C, the same as the room temperature. The drawback, of course, is that the fans spin at just under 2000 RPM, resulting in a loud background noise measured at 57.3 dB(A). The fan speeds and noise level are the same under full load as well, keeping the CPU at a relatively low 38° C.
The weakest cooling performance is realized (not surprisingly) when using only one fan with the help of the motherboard BIOS fan controller. Here a temperature of 25° C is reached in idle mode, which increased to 47° C under full load. The noise levels in this configuration are 41.2 dB(A) in idle mode and an audible 47.9 dB(A) under full load.
The most balanced mix between cooling performance and noise levels is achieved when using two fans that are regulated by the automatic fan controller on the motherboard. This results in a very low 22° C temperature in idle mode with a moderate noise level of 37.9 dB(A). We also find the temperature of 41° C at full load acceptable, as is the noise level of 45.6 dB(A).