Well, I finally did it. I have a 100% working Mavericks install on one of the most finicky motherboards for Mac OS X installations.
Go to final post for Mavericks update info.
Patched latest BIOS file (Backed up to Fat32 USB after automated install) with Power Management - PMPatch.sh
Installed some of EzyBeast,
including non-dsdt audio enabler + ALC88x and Lnx2Mac's RealtekRTL81xx v0.0.90
Now using VoodooHDA (with random crash fix), now have HDMI Audio too
Custom patched DSDT
Patched IntelCPUPowerManagement (AICPMpatch.pl)
Put graphics card info (GTX 650) into MacPro5,1 in AGPM kext -- set machine type in Chameleon Wizard or similar
GenerateCStates & GeneratePStates = Yes in org.chameleon.boot.plist
SMBIOS for MacPro5,1
What is working:
Correct reporting of CPU, RAM and speeds (hard-coded into SMBIOS file using Chameleon Wizard).
Sleep/Wake (one USB HDD is not waking correctly, but this is a spin-down issue that even effects Win7 - Uses a ridiculous USB->IDE/ATA Bridge)
USB3.0 (including Sleep/Wake) thanks to latest GenericXHCI kext
Rebuilt the Dydl cache using Onyx -> got many things working again, including SDLMame
Some power states seem to be functioning fine on CPU and GPU (very low temps)
Retail NVIDIA driver now available and working - no CUDA or OpenCL yet?!
Full QE/CI and all resolutions using default graphic kexts (GraphicsEnabler=No in boot.plist) via HDMI
Win7 hard drive working fine under VirtualBox (for emergencies - see Google for instructions) - AHCI SATA or IDE-ICH6 depending on your BIOS setup
Mac App Store -- restored all purchased items fine
Almost all my software tested and working fine, including CiderX and Wineskin games (after updating Wineskin wrappers)
What is NOT working correctly:
Card Reader not showing up as Apple Built-in. Have fix, will try tonight (SD-Card icon only) see below
CUDA/OpenCL, Perl patch should work -- will try with retail NVIDIA drivers tonight
OpenGLExtensionsViewer software started crashing on startup?! don't know why? 1st time I used it under 10.8.5
What is NOT tested:
2nd DVI port (almost certainly works)
HDMI audio (now available with VoodooHDA - will test soon)
Multiple Monitors (will almost certainly work with DVI+HDMI)