i find a kext for an audio but it for snow leopard, i think it will work on leopard .i use snow leopard on my GA EX58 UD3R board and everything run perfect included updates. just my ddr3 recognize like ddr2 but it's not a big problem.
Here is the kexts for an audio kext and i add link to ( how to guide ) for this motherbord for Snow Leopard, if somebody need it can try it.for an audio itry to instal few times kext with kext helper b7 cause my sound didn't work first time i install it( i just press instal than again instal than again instal after i reboot it was works good.)
thanks