there isn't that much of a difference in noticable means between the nforce2 and the nforce2 ultra 400 unless you are planning to OC a uATX board, (never heard of that one, uATX are generally not OC'd for soooo many reasons.) or if you plan to use a 400Mhz fsb Athlon. (most uATX boards don't have enough power supply ummph for that one anyway) Though if you want faster video, just get a faster video card. they support AGP8x, just like all the new systems.