is it sli compatible?
It is Crossfire compatibile which is similar to SLI. Just make sure the motherboard you get supports it. I had some 6850s in crossfire and although they seemed to make a difference in many games, they didn't seem to do anything at all in AH. From a pure performance standpoint, you will avoid a lot of headaches going with a single card solution if you can do it. Spending 500 bucks on an awesome GPU is far better IMO than spending it on 2 cards. Many games have issues with micro stuttering and other strange anomalies while using SLI or Crossfire. I know you are going for a show piece, so all that might not matter so much to you.
