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 the adapter, the GPU, and display information. It can also show overclocking, default clocks, and 3D clocks. It includes a GPU load test to verify the PCI-Express lane configuration.
It also has a validation of results, can create a backup of your graphics card BIOS and requires no installation, although an optional installer is available.