I'm having this problem too, so I guess I'll just hijack this thread rather than starting a new one.
I have the GA-MA785GPMT-UD2H board (not sure what the difference is between GMT and GPMT), revision 1.1 with BIOS v9. I've set all the settings to allow WOL on the Realtek network adapter through Windows device manager, but it does not work. There's no option to enable it in the BIOS, although the description of EuP Support says that enabling EuP will disable Wake-on-LAN, which suggests that Wake-on-LAN is normally available.
Any thoughts on how I can get this feature working? Would buying a NIC card help?