Lots of games have physics engines. I highly doubt it really
needs that much memory to render it.
Does the PS2 version lack the physics engine? Again, I suspect it's a case of them
just dumping the console version to the PC without much time spent tweaking it.
Better than nothing, but still. In practical terms this implies only people with new
PC's are going to be getting this game, that's assuming these reqs are accurate
without too much fudge factor.