I gave it a try. But i didn't work for me. Almost the same specs. Except my 6870. I'm not sure about wifi and bluetooth, but i use the onboard ones. Used the run_me.zip and compiled the generated dsdt.aml with dsdtse. Extended the dsdt.aml with the hdmi audio tweak. Audio over hdmi works now. Also patched the AppleIntelCPUPowerManagement.kext.
Sadly this thing doesn't wake up. Any ideas ?