you'll have really bad time with RBR & NFS MW.
each game's brilliant, but playing them on 256MB RAM..., serioulsly you'll be hating the game (coz nobody blame their PC
).
in RBR the control input will get delayed. NFS MW-> you'll miss the gorgeous gfx. of the game.
anyway, if you still go with NFS MW, then have a look here ->
Advanced Game Tweaks, might help in speeding up some process
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Racing Games
[click the pic]