I can only afford one or the other, and I have found significantly better upgrades for both CPU and GPU within my price range. I just do not know which one is holding back my game performance more. My current CPU is a AMD Athlon 64 x2 6000+ (dual core 3.0ghz, but VERY old), and my current GPU is a Nvidia Geforce 260 GTX. Considering the age of my processor, I'm betting upgrading my processor will give me the most significant boost in games, but I'm not entirely sure. Which do you think would provide the biggest upgrade for gaming performance?