Xaotic, you are right, but if you can only afford the 400 fsb, get them and later you can upgrade to the 3.06 533 chips and your ram will bump right back up, and it will not hurt the ram to under clock it for a while.
while the dual xeons will hsow up as 4 in XP pro (2 real and 2 virtual) in 2k server (any version) they will show up as 4 (but all 4 will be real, or at least the os will think so and miss schedule them) if you run XP pro you should not have any problems, and while alot of games right now will not get any performance boost, they may even take a slight (5-10%) hit (at most) from the duals, later games, i.e. the next year or so, more of them will be smp aware (or multi threaded to be exact) thanks to intels HT!
and you will fold with it right?