at home, i have 3 pc; a pentium 166, a petium II 450Mhz and a Athlon64 3200.
on the last one i've installed NFS UG2 it works great.
yet, i kinda envy with my friend PC, he has a athlon64 3800+ with 2Giga ram and 256MB vga, when i play NFS Carbon on it, i had to lower the display just so that the blur effects when hitting the NOS ain't so blurry.
well, for XBOX, i'm sure there's a downloadable version on Torrent
website hosting out there, try to check it out. Not that i'm sudgesting piracy or something...
it's for fun ...