Necrosis

CPU-Z is a freeware detection program base on the Panopsys hardware detection engine.
It allows to get some information on your system, including :

• 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 : name, vendor, BIOS, chipset, memory, AGP.
• Memory information : size, type, timings, specification

Updates:

New PCI devices report.
Switch for VCore report in .ini file.
VCore report on some uGuru mainboards.
Improved clocks computation.
Improved support for latest AMD CPUs, Celeron D 3x1 (EM64T).
Improved support for SiS 649, 650 and 656 chipsets, Intel 915PM chipset.
Improved stability when several instances of CPU-Z are running in the same time.
Restored html report in ghost mode (see "Parameters" chapter above).

http://www.cpuid.org/cpuz.php