Can someone please spec me a pci-express motherboard which is compatiable with intel dual core, and is fully (or nearly) supported by mac osx?

Thanks.

Gigabyte GA-945GZM-S2
Intel D945GCCR
Processors: Intel Pentium 4HT and Pentium D
2Gb RAM
120hdd each
I installed on both uphuck 10.4.9 v1.3
audio and ethernet needs patch on both
I'm about to test a P29G Pcchips...
cheers.

There are many.

Check out the wiki, http://wiki.osx86project.org/wiki/index.php/Main_Page

Go to the HCl components list for 10.4.8

You can choose between motherboards with 915,945,965,975 and p35 chipsets. So pick one that suits you!

...945g-based intel ones work particularly well...