Someone with experience tell me how well SLI works. I might very well get a 660Ti, keep that for a year or 2, then buy another for SLI. However I know crossfire has been very sketchy when it comes to reliability in a lot of games. Heard stories multiple times about just having to flat out disable crossfire to be able to play some games, and beyond that, games just not running very well with crossfire. Almost every Catalyst patch includes multiple "this game will perform better with crossfire" patch notes, which leads me to believe when new games are released they almost never work that great with crossfire until the cards drivers are updated. I have heard some complaints about SLI scattered throughout the interwebs, but not as much as crossfire. Tell me, how well does SLI work, is it pretty much in the same boat as crossfire considering they use the same techniques? Is it worth it to eventually SLI, rather than buy a beefy card from the get go like the 670? I've already read the SLI/crossfire faq thread, but it didn't give me exactly what I'm looking for. I want personal experience for the most part.