Hello, excuse my poor english , i'm from Belgium.
I'm on Snow Leopard on a M4N72-E motherboard. Everything works ! Ethernet (just a bug i must activate lan after the boot process, i try to fix but i just finishing the installation), Nvidia 8500 GT (qe/ci), sound ...
Just for your help, for my experience it's impossible with IDE. I buy a DVD-ROM in sata and use the Hazard DVD ....
Kernel 10.2 - For Sound just AppleHDA - NVEnabler and NVInject for NVIDIA - NforceLan installed automatically - Must put Apple RTC (because no DSDT.aml)

It's not my first Osx, some things must be fix in the futur but installation and boot is easy ...

Over

PS : at the end of the installation i have a bug just after reboot, i must shut down with the button but no worry that's work. Suppose you know how formatting and how manage partition and boot.
M4N72-E
Ahtlon X2 5200+
2Gb DDR2 - 800
Nvidia 8500 GT