Originally posted by Millz59
Do not get a dedicated PhsyX card that is low range. It will harm performance more than help performance. I do not recommend getting two mid range cards in SLI either, as SLI/Crossfire is never better than one very good card. You are bound to run into a lot of scaling problems and some games will just refuse to use more than one card. The best option is ALWAYS to get ONE good card. If you're thinking of getting two 660ti's ($600 bucks) Just get ONE 680 4GB and call it quits. You are much better off with one card UNLESS you are using something like Bitcoin mining (a totally different topic all together)
Actually I was thinking of having the 660ti as my personal high end. Maybe adding in a el cheepo card to boost it a little. or go for the 2way sli. It's disappointing to me but I'm not made of money =P
I know that if I tried running the two different cards in sli that it would only be as good as the worst card but I remember some Overclocking forum saying that using the lesser card (say something like a GTX 260) as a physx lets the better card reach a high potential because it doesn't have to do any of the complex physics math.
I remember hearing that running cards in SLI caused stuttering at certain framerates so if there isn't any significant price or performance difference I will definitely be skipping over this.