So I kind of want to kill 2 birds with 1 stone here. I am currently running with a AMD Athlon 64 X2 5000+ and 2GB of RAM (1GB each). If I was to upgrade to a AMD Athlon 64 X2 6400+ and 4GB of RAM (2GB each) would I have a noticeably faster computer? Im pretty sure that 4GB of RAM is max for Windows XP Home SP3 even though I have 4 slots on my motherboard? If im wrong please correct me. Thanks!