I am using an MSI motherboard and 2 MSI 6600 GT cards. I Am using SLI optimizer to force SLI in G3. It works good,it is a ltttle better with SLI vs 1 6600 GT card. Most all the settings are on high and i'm using 8x AA and 4X AF. iget about 50 FPS most of the time and it runs smooth. I tried G2 in SLI mode but it wont work at all. DOUG