Just to start off--I'm not too familiar with CPU upgrading and was hoping for some expert advice. I have a Dell Dimension 4600 P4 2.8 Ghz, socket 478, and I was interested in upgrading to a 3.4 Ghz, which I think is as high as the 478 got in terms of clock speed. First off, how can I tell if a P4 3.4 Ghz CPU I see for sale will be compatible with my board/system; and, second, will I notice a good boost from adding the 3.4 Ghz to my system ( I'm just hoping to squeeze a couple more years of gaming out of the system and was wondering if the 3.4 Ghz would help me do that or if the new games that will be coming out will be too much for even the 3.4 Ghz). Thanks very much for any insights.