Installation
Use default UniBeast for Mavericks installation guide, but boot flags are required for 1st boot and 2nd boot from UniBeast-created USB. Type the following at boot screen.

For details see Troubleshooting: Issuing Boot Flags
Post Installation
6 and 8 core CPUs need a special kext called VoodooTSCSync by Cosmosis Jones of VoodooProjects. Install to /System/Library/Extensions using KextBeast or DPCIManager.
Depending on motherboard and UEFI version, it may be necessary to use NullCPUPowerManagement.kext. GA-X79S-UP5 UEFI version F4 or later does not require NullCPUPowerManagement. In order to boot successfully, npci=0x3000 is always necessary. Add to /Extra/org.chameleon.Boot.plist under Kernel Flags.

MultiBeast 6 Settings
Backup File (.mb) for Gigabyte X79S-UP5 - Core i7-3930K - GeForce GTX 570: GA-X79S-UP5.mb
This MultiBeast configuration was made for the Fermi-based GeForce GTX 570 that requires GraphicsEnabler =Yes. Please adjust accordingly for the GPU you actually use.