For future people looking for information on this board (EP35-DS3R) and Snow Leopard:
I have had Snow Leopard running for a week now using blackosx's infamous method (the Boot CD worked best).
I found a great working dsdt here:
I used the one without GFX (I use EFI string GFX). This dsdt had cmos fix, ethernet, internal USB ports for better sleep, working audio with kext file given in that post.
I have also added this kext to my E/E folder:
And I get fully supported Sata ports (no orange icons). I run the 64 bit kernel and Chameleon RC3 with the following kexts:
Honestly it runs so much better than the same setup with Leopard (10.5.6), its amazing! I have attached the kexts I use.