I just finished building a system for my brother with a P4 1.6A and Shuttle AS40GT SiS 645 mobo. I use the stock cooling fan that came with the CPU (retail box).

Everything went fine. Win XP installed fine and its still running good w/out any crashes so far. However I checked the CPU temp in the BIOS and it said 45 deg celcius. This was after the comp had been on a few hours and I rebooted.

That seems a little high to me. The CPU fan is only spinning at 2400 rpm. I checked the installation and it looks good. I installed the heatsink exactly according to the instruction that came w/ the cpu. I am not too worried cause everything is running fine but now I am very reluctant to try overclocking it.

Is this normal? Do I maybe have a defunct heatsink or fan? The case is an Antec SX830 and gets good airflow from case fans. Thanks