GPU-Z , GPU / VGA / Graphic Card Identification Utility Software

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

• 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 / Windows 7 (both 32 and 64 bit versions are supported)

You can download GPU-Z in http://www.techpowerup.com/downloads/SysInfo/GPU-Z/