just saw this post... any luck?
anyway, here's mr. bald's response to my exact question... please note some, if not all, of the links may be obsolete and may need to find them manually... btw, this worked for my x58a-ud3r v2
First thing - to get your graphics card working go here http://www.tonymacx86.com/viewforum.php?f=69/ and download the nVidia update package and install it. Reboot.Now, to get sound to work with the kext files available in MultiBeast you need to download a DSDT.aml file for your mother board, matching board rev number and BIOS rev number from here http://www.tonymacx86.com/dsdt.php and put the unzipped file on your desktop (don't worry about the long file name - it gets changed when it is copied to /E). Launch MultiBeast and select USERDSDT & system utilities and hit continue to install. Reboot.If you installed LegacyALC889Enabler kext in S/L/E then delete it. If you installed any voodoo audio kext files in S/L/E or in /E, delete them. Launch MB again and this time select the ALC8xxx.kext file by macman and the 10.6.2 AppleHDA.kext rollback + system utilities and hit continue to install. Reboot.You should now have sound from front panel earphones. Open preferences / sound and change output to internal speakers to get sound on green jack in the back plane.For your network driver, go here http://bit.ly/dcyApt and get lnx2macs RTL81xx ethernet driver and download the installer package and run it. Don't worry about existing ethernet kext files - his installer package creates a folder on the desktop and moves all the old ones there. You can drag them to trash later. Repair permissions and rebuild caches (easy way is to launch MB again and check mark only system utilities and hit continue to run it. RebootYou should now have a working graphics, a working ethernet connection and working audio.