CPU-Z will provides information on your CPU and some of the main devices of your system, including:

CPU:

* Name and number.
* Core stepping and process.
* Package.
* Core voltage.
* Internal and external clocks, clock multiplier.
* Supported instructions sets.
* L1 and L2 cache information.
* Location, size, speed, and technology.

Mainboard:

* Vendor, model and revision.
* BIOS model and date.
* Chipset (northbridge and southbridge) and sensor.
* Graphic interface.

Memory:

* Frequency and timings.
* Module(s) specification using SPD (Serial Presence Detect) : vendor, serial number, timings table.

System:

* Windows and DirectX version.