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

GPU-Z supports NVIDIA, ATI, and Intel graphics cards. It can display adapter and the GPU and display information. It can also display overclocking, default clocks and 3D clocks. It includes a GPU load test to verify PCI-Express lane configuration

It also has validation of results, can create a backup of your graphics card BIOS and requires no installation although an optional installer is available.