Ok, I have just installed my second 9800 GT Video card, the first one and the second one are by the same manufacturer. I am running Windows Vista Ultimate 64-bit, 8 gigs Corsair RAM, 400 Watt PSU(For Motherboard and drives), 650 Watt Thermaltake Toughpower PowerExpress PSU(Video Cards Only), ASUS Mobo M3N72-D.
When I turn on SLI, I cannot play WoW or any other game because the screen is all messed up, what it looks like to me is that it is trying to display both screens and they are not syncronized. I have looked all over every forum, called tech support and sat on hold for 25 minutes without anyone helping me. If I turn SLI off, the games run fine, but nothing but windows will run with SLI on. Anyone have any suggestions or ideas that may help?