Why spend that much money just for an Intel CPU running at a 200 FSB?
From a price vs. performance perspective, a cheaper XP CPU, nForce2 motherboard and PC3200 DDR would probably give you equal, if not better, performance, and at an overall cost that's probably less than the Intel CPU alone.
IF a 800 FSB (200 MHz quad-pumped) Intel CPU were to be released, I'd guess the price would be pretty steep. (i.e. at least $650)
compare that to the following "highly overclockable" AMD system already available:
nForce2 mobo $150
512 MB PC3200 DDR $150
XP2700+ CPU $325
If my OC'd XP1700+ w/ 200 FSB can beat a similarly equipped 3.06 GHz P4 HT in 3Dmark, I can only guess what a OC'd XP2700+ can do...
That said, I don't know how you could even consider comparing it's performance to an XBox.
XBOX equivaltent:
Intel Pentium III @ 733 MHz
64 MB RAM
300 MHz GeForce2 graphics