I think damnesiac is right about EFI.

I have no Idea what the exact Error is, but it's certainly related to forcedeth, as Marvell's skge.kext (for my Marvell Yukon LAN Port!) and Wi-Fi always worked flawlessly for me on Rev.1.

Lan Freezes only occured whilst using nForce LAN and forcedeth.

The problem might be solved by manually installing EFI on Rev.1, I don't know whether the kexts of mine will be compatible with yours, I doubt it actually. You can try if you want to...