I am upgrading my wife's dimension 4300, all original 2001 system. It has the original Intel Pentium 4, 1.6 GHz, 256/400/1.75v processor in it. What is the best processor to install that will be a direct plug-n-play for improved performance with the original motherboard? Of course, not on the high end for cost as the computer is my first revamp, and am E-Bay'ing parts cheap for it, but want it to be decently usable afterward. I will tackle a more expensive build when I get my feet wet on this one. I am adding another 512mb memory card in place of the 256mb card in it now to go with the 512 card that was with it, and a video card upgrade, along with a wireless card, and a high speed USB card. I would like the machine to be able to play Ghost Recon...the original, if possible.