TechPowerUp GPU-Z (or just GPU-Z) is a lightweight utility designed to provide information about video cards and GPUs.
The program displays the specifications of Graphics Processing Unit (often shortened to GPU) and its memory; also displays temperature, core frequency, memory frequency, GPU load and fan speeds.
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.