Thats what I though too, before I read this on nvidia's site
http://www.nvidia.com/object/IO_23412.html
GEFORCE 6600:
These graphics cards do not use the SLI Connector, But they are SLI ready. So thats what makes it a little confusing to understand. I know the SLI bridge is slower but I wanted to know can it be done meaning putting two standard 6600 into the system and by using the driver nvidia provide ?