Try installing the Voodoo Kernel. You can get it here: http://code.google.com/p/xnu-dev/

Here is a direct download: http://xnu-dev.googlecode.com/files/..._1.0_Rev_A.dmg

Remember to use a matching system.kext which I believe is included in the package.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
Monitor: AOC Q2963Pm 29" WFHD 2560x1080 21:9
Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves