Wow 12gb of ram! Congratulations!
Actually I have just 2GB.. hope to improve the ram soon.

About your Boot.plist, do you think the string "<key>Kernel Flags</key>
<string>-force64 GraphicsEnabler=Yes</string>" is correct?

I have nothing in kernel flags and graphics in that way:
<key>GraphicsEnabler</key>
<string>Yes</string>
The system boot in 64bit by default.

Again thanks for your info.

For adriangb: thanks for the kernel suggestion. I confirm that the Empire CD kernel just work in our board, but I have extracted the X.6.3 apple original and also work, no differences.

By the way actually I boot with 6 kext, that my system absolutely need:

evoreboot
fakesmc
IONetworkingfamily
NullCPUPowermanagement
PlatformUUID
RealtekR1000SL

I do not need JmicronATA.

The 7th kext can be the legacyHDA, but at the moment I'm still investigating why I do not have sound, with the same adriangb DSDT... ?!