Just wondering the advantages and disadvantages of the two. I have a Shuttle AN35 400 Ultra and would like to get one of those 2500 bartons and over clock it as far as it will go. I've read that a gig of ram won't take an over clock as well, and may not add that much unless you're into CAD or high end graphics. I'm presently running Win XP Pro and do play games like UT, UT 2003, and plan on Half Life 2 and Doom 3 when they do arrive. Any thoughts? njrich2