Copied from GPU-Z Homepage:


GPU-Z is a lightweight utility designed to give you all information about your video card and GPU.


Main Features


* Support NVIDIA and ATI cards

* Displays adapter, GPU and display information

* Displays overclock, default clocks and 3D clocks (if available)

* Validation of results

* No installation required

* Support for Windows 2000 / XP / Vista (both 32 and 64 bit versions are supported)

* BETA SOFTWARE - please test and post feedback in the forums

* .. and yes, the author of CPU-Z has granted us permission to use a name similar to his product. Thanks Franck.


Documentation

It's so simple to use, you don't need documentation.
Just download and run the binary. 



Changelog:


* Added support for RV740 (HD 4750, HD 4770) and RV790 (HD 4890)

* Fixed G98 shader count

* Fixed GT200 process size calculation

* Added support for GTX 275