Its mainly the settings you put it on. SLI scales best compared to single GPU's in high resolution. And when AA is turned on i think. Otherwise, SLI is sorta worthless.
Thanks for all of the advice and recommendations for the new gaming rig. I just found out that my wife and are expecting our first child so I'm going to have to shelve the new rig for a little bit. At least until the nursery is done
I'll definitely post an update to the specs when I get back to shopping.