Right now my computer is...basically a POS. It is a HP Pavillion 667mhz Pentium 3 eith 384mb ram, and 30gb hd. My question is, when upgrading to a new computer (either Athlon 64 3500+, 3700+ or Intel Pentium 3 630) will I notice a big difference between the new processors or will they new processor selected not matter all that much because they are soooo much faster than my computer right now?