GPU-Z is a lightweight system utility designed to provide vital information about your video card and graphics processor.

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.
Enterprise Licensing
GPU-Z is free to use for personal and commercial usage. However, you may not redistribute GPU-Z as part of a commercial package.
We also offer a GPU-Z SDK, which is provided as simple-to-use DLL with full feature set. Commercial support and customization options are available, please contact us for details.

Back-up Link: Gpu-Z 2.43