Hi, I own a Dell Optiplex GX620 that I recently bought from amazon.com (used) and I decided to add two video cards into it a ATI Radon 9450 and ATI HD 6450 and thought that my computer will be OK now running some games and doing heavy work on, well, I started to become very annoyed about the Pentium 4 that came with my computer that runs very slow, and was wondering if I could put the i3 processor into my computer, I know I can use the Core Duo processor in it but it costs more on amazon.com than the i3 (which is faster) so yeah, (note that I have decided not to upgrade the ram since I have put 8 GB if ram in my laptop that originally came with 3 GB of ram and did no difference and so I am not intending to upgrade the 2 GB ram it came with it) also I run Windows XP Professional, hope that's is the best I can say I did read some articles that said that the whole motherboard might need to be upgraded too (if that occurs then I don't plan to upgrade my computer then). Thank You and hope you can help my problem.