techPowerUp - (Freeware)
GPU-Z is a software that provides the user important information about the graphics card.
 GPU-Z is a small but powerful application that offers essential information for all of the graphics card version GPU, BIOS, frequency, etc.
 
 The simple and easy to use interface displays a window with information such as the ID, shaders, the type of memory bandwidth, the version of the driver or the frequency of the GPU. 
 
 GPU-Z application works with nVidia or ATI card types.
 
 * Added PowerColor hardware giveaway
 * On multi-GPU systems, GPU-Z will remember the selected card from the selection dropdown
 * Added full support for AMD A-Series Fusion processors
 * Added detection for ASUS MARS II
 * Fixed shader count detection for Blackcomb (mobile AMD Cayman)
 * Improved BIOS version reading on NVIDIA
 * Added support for NVIDIA GeForce GT 560 Ti OEM, GT 545, GT 530, GeForce GTX 580M, GT 555M, GeForce 520MX, GT 520M, 410M, 305M, Quadro 5000, Quadro 4000M, Quadro 400
 * Added support for AMD HD 6290, Radeon E6760 & E4690, FirePro V8800, FirePro V3700, FirePro 2460 (FireMV)