Really? It runs fine with a MX 400? Is that a 64mb card? My buddy had something similar to that with a 1.8gig p4, 512mb ddr ram, on a 56k and he had to keep all the detail down so it looked horrible and didn’t run all that well either. I sold him my Geforce4 ti4200 (after switching to a radeon 9600pro) and that made all the difference for him.
In all honesty I think a good system for this game would be something like this (judging by other people I know that have the game)…
Pentium 4 1.5 - 2.0 gig (or AMD equivilent)
512 - 1gig of DDR ram
At least a Geforce4 (non mx series ti4200+ or the Ati Radeon 9500+)
more then 10 gigs of free space
DSL or Cable connection
That isn’t to say that the game won’t run with anything lower then that but for the best performance that would probably be the best system specs for it.
Dang, after reading all these posts I’m half tempted to start playing FFXI again…thanks alot… 
