Hey guys, I need a little help choosing what video card(s) to run on my system.
First of all, in your opinion, do you think I would be better off going with CrossFire/SLI. Or going for a powerful single card? So far, I'm leaning towards Crossfire/SLI a bit, because it seems I will almost always get better performance with that, unless of course the game does not support it or scale it well, but it seems most games do these days.
I have seen GTX 570's for $290 after rebate on Newegg this past week, so be sure to check for bargains. Generally, for reference designs, the 570's will be cooler and quieter. For drivers and stability, I would give the nod to the 570's as well, particularly with the new "auto-update" feature for SLI profiles implemented in the latest Nvidia drivers.
To gauge performance you want to compare the actual games you intend to play to see which setup performs better. Different games will have a preference for one or the other. Of course, if you play any PhysX games, only the GTX 570's will render PhysX effects.
The scaling between the 570's in SLI and 6970's in Crossfire is similar and depends on the game (click for a larger image):
Performance also depends on the game (negative values to the left of center favor the 570's in SLI).: