http://www.cpuid.com/cpuz.php
CPU-Z is a freeware that provides some information on your CPU :
Processor name and vendor
Core stepping and process
Processor package
Processor current core voltage
Internal and external clocks, clock multiplier
Partial overclock detection
Processor features, including supported instructions sets.
L1 to L3 cache information : location, size, speed, technology.
Motherboard information : BIOS, chipset, memory, AGP.
Memory information : size, type, timings, specifications.