My motherboard has temperature sensors built in, including one within the processor socket that touches the underside of my CPU. (In fact, when my processor overheated, part of the plastic coating on this sensor melted and stuck to the CPU!) There's also two sensors at different points on the mobo itself. I can view the current temperature from within my BIOS sensor, and I use a freeware utility called Speedfan to monitor my CPU and motherboard temperature, as well as the RPMs of my fans, all in realtime, under Windows. The CNet download for it is down, so I've uploaded it to our FTP server. It's in a new directory called Utilities; you'll need to login with the password to get at it.