TechPowerUp GPU-Z
 

GPU-Z the fast video and graphics card tester program. It's a very simple and completely free for any PC users. Anyone can easily to get full information of his computer graphics card name, released date, temperature, power, speed, memory size, clock, load time etc and more any other internal hardware physical health. GPU-Z is free utility tool that best Windows-exclusive program. It can be supported by NVIDIA, Intel and ATI cards etc.

So try to the best PC GPU tester software TechPowerUp GPU-Z.
More useful complete free PC software .