I upgraded from P4 E2220 Dual Core CPU and Gigabyte GA-73PVM-S2 motherboard to Athlon X4 620 CPU and MA785GM-US2H but my gaming performande didn't improve as expected. I'm using my GTA IV benchmark results to reach this conclusion. GTA IV is supposed to be optimized for multi-core so I expected a considerable improvement in my 21 FPS average. My video card is a 8600GT and I read somewhere that sometimes there are compatibility issues because of the chipsets. Can somebody tell me is this is true and tell me if there is some kind of application to avoid this issue?