Ok, I am looking to build a system and I am slightly confused about some of the systems I'm seeing. For instance, I found a Intel Celeron 2.6ghz for 250$ and a Pentium 4 2.5gz for 325$. They are by the same seller and the same company so my question is this, what's the difference. The Celeron is cheaper and faster, any ideas as to why? Also I've seen this with AMD proccesor's as well, where they are more expensive and have less hertz. Thanks!