Genome, now you're really pusing it :eek: I don't really know what the speed difference is as I have never seen an article comparing the one processor Xeon w a P4. What is evident is that it has hyperthreading. However, you run at a slower 400Mhz FSBus. I believe the significance of the Xeon is that you are able to run multiples of them on a motherboard (between 1-4). I know there are multi chip P3's around, I'm not sure about the desktop P4s. In any case, it's useless to use multi chip anything unless your program supports it, and I don't know of any trading program that does. And MS Office surely doesn't.