Quote Originally Posted by Toy
You would need a pretty strong computer.

Computer fried has told me that to box 3 on one computer you need 2.5 ghz dual core, 2gigs of ram, and a badass video card.
I've got the 2.5 dual core, but only one gig of RAM and not that great of card. I haven't tried running three yet, but two copies run at 60 fps with high graphics...