Many newer motherboards show the cpu and board temps in the bios setup screens. Of course you will have to reboot to get into bios. 2 of my 3 system in my house have this feature. The AMD K62 500 runs at about 110F. The AMD Anthlon 1.6 runs around 123F. The hottest I have seen the 1.6 at is 128F.
The 500 fan went out and the bios started beeping when the cpu hit 150F...allowing a safe shutdown. By the time I opened bios to check the temp, it was at 157F....7 degress in a couple of minutes. I only buy ASUS boards that have this protection since it saved me once.
Hope this helps.
Ryan