Ok, after doing some tests with Nebula Wars I think it's definitely the GFX card as everyone suggested. I think the processor is actually faster than my Athlon 64 2800+ because the 64 begins to slow down earlier with tons of bullets flying in Nebula Wars than the 3200+ Sempron. Kind of surprising considering the Athlon is 64 bit and has a higher clock speed. I guess those new numbers in front of the processor names actually mean something.