I got SLI working on K9a2 (790fx+SB600) using this thread:
http://www.xtremesystems.org/forums/...d.php?t=231383

a few weeks ago,however there were some limitations -
only worked with 1 force ware driver and adding
ram/ another gpu would BSD on boot up.
Only worked in "test mode" (driver checking off) in win7.