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, specifications.


Supported Hardware and OS

CPUs

Quite all Intel’s and AMD’s CPUs that hold cpuid instruction are supported.
Latest i486, Pentium, Pentium MMX, Pentium Pro, Pentium II, Celeron, Pentium !!!, Pentium 4, Pentium !!!-M, Pentium 4-M, Pentium M;
Am5x86, K5, K6, K6-2, K6-III, K6-2+, K6-III+, Athlon (4, XP, MP), Duron, Athlon 64, Opteron ;
VIA C3 (Samuel, Samuel2, Ezra, Ezra-T, Nehemiah), Cyrix M1, M2 ;
Notice that all informations are not provided on all CPUs.

Chipsets

Following chipsets are fully supported :
Intel i430TX, i440LX, i440FX, i440BX/ZX, i810/E, i815/E/EP/EM, i845, i845E, i845G, i850/E, i845PE/GE, E7205 (Granite Bay), E7500, i852, i855, i865P/PE/G, i875P, i915P/G, i925X.
VIA Apollo VP3, Apollo Pro, Apollo Pro +, Apollo Pro 266, KX133, KT133(&A), KT266(&A), KT400, P4X266(&A), PT880, K8T800, K8T800 Pro.
AMD 751, 761, 762 (760MP).
SiS 645, 648, 735.
nVidia nForce 1, 2 , 3 & 4 series.
Other chipsets may be partially supported (no AGP or memory information).

Operating systems

Windows 95, 98, Me, NT4, 2000 and XP. The Windows 64 bits versions for AMD64 systems are supported.