I know what settings i have to use for my intel board maby it could help You 2
http://p5w-dh-deluxe-osx86.wikidot.com/bios-settings
second there is somthing called the sleep trick for the 3100 have you tryed that?

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Asus P5W DH Deluxe runnig osx for 3 years now (10.5.4 ideneb)
Asus P5N 7a VM 10.5.7 custom installation
dell 6400 10.5.1 intel video
Iportable OSX86 universal = Live leopard for intel and AMD's on a USB stick!