Cpu problem?

i have an amd phenom II x4 920
evga gtx 260
4gb ddr2 1066
bfg 550w psu


i for some reason get jumpos in game play such as call of duty 4 and bioshock. at first i thought it was a driver issue until i swapped my phenom II x4 920 for an overclocked 5600+ and got muck less jump but still jump. i also got better start up times and my wow was playing better in denser areas. i was wondering if this was my cpu.


i have windows vista 64bit with 2hdd's 1. 250gb and 1. 160gb

You replaced a quad core with a dual core 5600,AND ,,, things ran a little better,got the right bios??,is your ram 4x1,get 2x2,timing issues some boards have with 4x1 ram..cool and quite supposed to give power when and as needed..