discovideo3 :
gpu-z, hands down the best out there for monitoring regular activities or overclocking http://www.techpowerup.com/gpuz/
Believe the OP was looking for a program for the
CPU, I'm fairly certain that
GPU-Z is for
GPUs.
But on that note CPU-Z is a good program for CPU related information, however it does not tell you the temperature of the CPU like SpeedFan does, nor let you control and monitor fan speeds.