Well, I would say bite the bullet and get you a GTX 285. I moved from crossfire 4870's to a single GTX 285, and more games ran better(smoother on the GTX 285), some faster, but without that stupid CCC. I now have GTX 285's in SLI on a 24" dell. No game I have now,(and I have alot), can drag...
It is funny that other boards worked in Tri-Sli, but no this one. The only real difference between them all is this board has the NF200 chip. I like NVIDIA videocards, but lost fondness for their motherboards after the NF4. Could it be the NF 200 is the culprit?