Well here's my 2 cents, try these drivers for your graphic card ftp://download.nvidia.com/Windows/91.31/91.31_winxp2kmce_english_whql.exe The newiest ones seem to have problems with SLi. Secondly, The 3800 x2 is a crappy proc at stock speeds. You won't unlease it's true potential if you aren't 2.35+GHz high. I have had this CPU for a little over a year and trust me all the playing I have done it, it needs to be OC'd. Or you could always buy a new CPU Did you enable SLi and SLi offload balancing between the two cards?