I currently have an Asus P4P800 Dlx mb, 2.8c P4, 1 gb PC3200 RAM and ATI X800 Pro. Would I gain any noticeable difference upgrading to an XP64 cpu? I was thinking about the 3500 for overclocking or would it be better just to buy the 3800? I mainly use my system for playing games. Thanks for any comments.