You're right and a little off Spud. The problem with physiX is just what you mentioned, that you need a second gpu or watch your fps drop like a rock. Hence the other alternative, havoc which is cpu bound and doesn't have the fps hit as long as you have at least a dual core.
However SLI now with the i7 chips is starting to stretch its legs as the drivers have been coded for multi core cpus, prior to i7 you'd have a decent argument but it still shows an improvement, however small or great it was, when the game is coded to take advantage of it. Xfire has yet to do that but could also show similar results if or when implimented for multi core chips. The biggest problem with the graphics cards is the drivers, both companies need to really really focus on releasing an excellent driver before they go on to creating a new card but there's no money in the drivers soooo you get the picture.
Flyingbullseye
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