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GPU-Z is a lightweight utility designed to give you all information about your video card and GPU. GPU-Z is a small-sized software utility that collects information on the computer's graphics card and sensors, while allowing users to supervise temperature, used memory and other data. The application offers support for OpenCL, CUDA, PhysX and DirectCompute. If there are multiple graphics cards implemented into the PC unit, it is possible to view all these details for each one.

Main Features:

Supports NVIDIA, AMD, ATI and Intel graphics devices
Displays adapter, GPU and display information
Displays overclock, default clocks and 3D clocks (if available)
Includes a GPU load test to verify PCI-Express lane configuration
Validation of results
GPU-Z can create a backup of your graphics card BIOS
No installation required, optional installer is available
Support for Windows XP / Vista / Windows 7 / Windows 8 / Windows 10 (both 32 and 64 bit versions are supported)
.. and yes, the author of CPU-Z has granted us permission to use a name similar to his product. Thanks Franck.

GPU-Z is free to use for personal and commercial usage. However, you may not redistribute GPU-Z as part of a commercial package.