My understanding is that while SLI is good.. it's not really beneficial for too long.
Once the next video card comes out, it's not going to be any better. So while you're spending a lot of money just to get that feature, the next video card coming out will be just as good, probably better.
Considering the FX though, your occupation as a developer, you have a lot of money because you don't have a wife to take all the money away
So with that being how my mind thinks, test the SLI out for me and let me know how it works
Check out the Video Card forum, they're talking about SLI in there and I don't think it's getting the huge reviews from end users like the big companies were hoping.