Originally Posted by artem
I guess if SLI doesn't even work under Windows you should address Asus support.
Try updating BIOS though - nowadays newer motherboards in order to support SLI must contain a special SLI BIOS record - it's quite possible this record is faulty/doesn't exist in your BIOS.
I checked this BIOS, and it has the SLI certificat I an see it dumping the BIO memory, so it should be fine from this end.
There has to be something else. I found some people reporting similar things (SLI not working on certified mobo's with cards which should do SLI, but no answer to them.