I have an old Intel motherboard in my Dell Desktop which is running a P3 900MHz CPU. As new software comes out and requires more RAM, better sound and video cards, and faster processors, I have been updating my computer. It is nice to do myself, since I get to learn about my computer and as a physicist I have long relied on others to do so. Well Intel has cancelled support for my motherboards and I want to upgrade my Pentium 3 to a Pentium 4 CPU. But I have no idea what P4 is compatible with my motherboard. Anyone every have to deal with this? Any ideas on web resources? I already checked Intels site and they don't have anything about the P4s being compatible- only the P3s. Any help or wisdom would be great.