Thank you all for replying
Each video card would run with a different processor since I'm trying to pick from a few different computers:
The ATI Radeon HD 5450 1GB would be running with an AMD Phenom II 820 x4 2.8 GHz
The ATI Radeon HD 5670 1GB would be running with an AMD Phenom II 820 x4 2.8 GHz
The ATI Radeon HD 5830 1GB would be running with an AMD Athlon II 635 x4 2.9 GHz
The ATI Radeon HD 5850 1GB would be running with an AMD Phenom II 955 x4
Which graphics card would work the best with their corresponding processor?