Follow these steps to perform a clean installation of macOS Monterey on your Ivy Bridge GA-Z68X-UD3H-B3 system.

Time Machine backup of your current installation will allow you to easily restore files with Migration Assistant after a clean installation.

A discrete graphics card compatible with Metal will be necessary to install macOS Monterey using this guide. The included config.plist uses the iMacPro1,1 system definition for the widest compatibility. Some graphics cards, including the RX 580, will perform better if the system definition is changed with OpenCore Configurator to iMac18,3.

If you have a Sandy Bridge CPU it will be necessary to make adjustments to the config.plist included in this guide. Those adjustments are detailed in the Sandy Bridge section of the OpenCore guide here. On Sandy Bridge systems it may also be necessary to replace HfsPlus.efi in /EFI/OC/Drivers with HfsPlusLegacy.efi available here.


  1. Update the BIOS to the latest UEFI version

    • ​See the guide here if you are updating from a legacy version of the BIOS (version F12 or earlier)

    • See the modified BIOS here if you want to use an NVMe SSD

  2. Press F12 at startup to enter BIOS setup and select the following:
    • Save & Exit Load Optimized Defaults
    • M.I.T. Advanced Frequency Settings Advanced CPU Core Features CPU EIST Function = Disabled
    • M.I.T. Advanced Memory Settings Extreme Memory Profile (X.M.P.) = Profile1 (or set to Disabled if your RAM modules do not support Intel XMP)
    • BIOS Features Intel Virtualization Technology = Enabled
    • BIOS Features OS Type = Windows 8
    • BIOS Features CSM Support = Never
    • BIOS Features Boot Mode Selection = UEFI Only
    • Peripherals → SATA Mode SelectionAHCI



  3. Download the Install macOS Monterey app from the App Store

  4. Insert a 16GB or larger USB drive

  5. Open Applications Utilities Disk Utility

    • Select the USB disk in the left pane (select the physical disk, not a volume on the disk)

    • Click the Erase button

    • Under Name: type USB

    • Under Format: select Mac OS Extended (Journaled)

    • Under Scheme select GUID Partition Map (If the Scheme option is not visible, go to the View menu and select Show All Devices)

    • Click Erase

  6. Open Applications Utilities Terminal and enter the following command:

    sudo /Applications/Install\ macOS\ --volume /Volumes/USB --nointeraction


  7. Enter your password when prompted

  8. After approximately 25-35 minutes the process will finish and the USB will be renamed Install macOS Monterey (wait for the “Install media now available” message in the Terminal before continuing)

  9. Download the GA-Z68X-UDH3-B3 macOS 12 Utility and Kext Pack and place a copy on your installation USB

  10. Launch OpenCore Configurator from the Utility and Kext Pack and select Mount EFI from the Tools menu

  11. Click the Mount Partition button to the right of the EFI partition of your USB. It will appear as EFI on Install macOS Monterey

  12. Quit OpenCore Configurator and copy the entire EFI folder from the Utility and Kext Pack to the EFI partition of your USB, replacing the existing folder if present.

    The EFI partition on your USB should now contain a single folder named EFI that contains two folders: BOOT and OC
     It should look like the image here (click to enlarge) →


  13. Eject your USB drive


    Note that if you have an AMD graphics card it may be necessary to connect the monitor to a DisplayPort output during the installation process. All graphics ports should be fully functional once the installation is complete, however DisplayPort should be used if possible.


  14. Disconnect all drives from your computer except the drive you will be installing macOS on

  15. Insert the USB installer and press F12 at startup to select the USB as your boot disk

  16. Use the arrow keys to select Install macOS Monterey at the bootloader menu and press Enter

  17. From the macOS Recovery screen, launch Disk Utility

    • In Disk Utility, click the View menu and select Show All Devices

    • Select your target disk (select the physical disk, not a volume on the disk) and click Erase

  18. ​Name the target disk Macintosh HD, select APFS format and GUID Partition Map scheme, then click Erase

  19. After the erase process finishes, quit Disk Utility, select Install macOS and follow the prompts to do a standard macOS installation on Macintosh HD

  20. The first stage of the install process should take about 5 to 10 minutes (if the screen dims you can press a key to wake it)

  21. The computer will restart at least once during the next stage. When it does, press F12 to ensure that it boots from the USB (OpenCore). At the bootloader menu, select the option labeled macOS Installer and press Enter to continue.

    The installation process will then continue very slowly and it may appear to hang at times - just wait and it will eventually continue. When the computer restarts again, press F12 to ensure that it boots from the USB.


  22. When Macintosh HD (or Preboot) appears on the bootloader menu, select this entry and complete the guided macOS setup



  23. Copy the Utility and Kext Pack to your Desktop and eject the USB installer

  24. Open Applications Utilities Terminal and enter the following command to allow apps downloaded from unidentified developers:

    sudo spctl --master-disable


  25. Launch OpenCore Configurator from the Utility and Kext Pack and select Mount EFI from the Tools menu

  26. Click the Mount Partition button to the right of the EFI partition of your hard drive. It will probably appear as EFI on APFS Container

  27. The EFI partition for Macintosh HD should now be mounted and show in the sidebar under Devices when you open a Finder window

  28. Quit OpenCore Configurator and copy the entire EFI folder from the Utility and Kext Pack to the EFI partition of Macintosh HD, replacing the existing folder if present (just as you did in step 12 for the installation USB)

  29. Install any system updates available through Software Update and the App Store

  30. Consider generating a unique serial number for your system to avoid potential issues with Apple applications and services such as FaceTime and iCloud by following these steps:

    1. Launch OpenCore Configurator, mount your EFI partition​ and then open your config.plist

    2. Select the PlatformInfo tab, then click the arrows next to the Check Coverage button shown here and select iMacPro1,1

    3. Click the Check Coverage button and confirm that you receive the "We’re unable to check coverage for this serial number" message from Apple (that's right, you want a serial number that has not been assigned to an actual computer produced by Apple)

    4. Select File → Save in OpenCore Configurator and restart the computer

Notes​ and Suggestions​​

  • If using Migration Assistant to restore files, do not select the System & Network option when selecting information to transfer

  • USB 2.0 devices may not function properly when connected to a USB 3.0 port. For more consistent USB 3.0 performance, install a macOS-compatible PCIe USB.3.0 card

  • To prevent attached optical drives from polling every few minutes, enter the following command in Terminal: sudo pmset -a disksleep 0

  • Install Intel Power Gadget to monitor CPU power, frequency, temperature and utilization

  • A simple method for custom key remapping is available here

  • OpenCore updates can be installed following the steps explained here

  • The configuration in this guide does not include SSDT patches because our testing indicates these patches are not necessary for CPU power management, embedded controller, USB and IMEI device features to function suitably with this motherboard. Please let us know if your testing suggests otherwise.



Graphics Card (AMD): SAPPHIRE AMD Radeon RX 580

  • No configuration necessary

  • Automatically recognized by macOS with full Metal compatibility for Monterey

  • Monitors should be connected to DisplayPort outputs on the card rather than DVI or HDMI, if possible.

Wireless + Bluetooth Adapter: Fenvi T919 Broadcom BCM94360CD Adapter

  • No configuration necessary

  • Automatically recognized by macOS as built-in AirPort and Bluetooth

  • Supports 802.11a/b/g/n/ac, Airdrop, Handoff, and Bluetooth 4.0 in BIOS/UEFI and Bootloader

  • Install in PCIe x1 slot

USB 3.0 Adapter: Inateck KT4006 2-Port PCIe USB 3.0 Express Card

  • No configuration necessary

  • Automatically recognized by macOS as built-in USB 3.0 Hi-Speed Bus/SuperSpeed Bus


Keyboards: Apple Wireless Keyboard or Apple Wireless Keyboard with Numeric Keypad

Any standard USB keyboard will work with this system, but Apple keyboards provide the functionality of various macOS-specific key mappings




Modified BIOS for NVMe Drive Booting


BIOS Boot Loop

If the computer does not boot and continually restarts, the BIOS may have become corrupt. To restore the backup BIOS and resolve this issue:

  1. Unplug the computer

  2. Press and hold the computer's power button

  3. While holding the power button, plug the computer in again

  4. As the computer turns on (in one or two seconds) unplug the computer again

  5. Wait a few seconds, plug in the computer and then start the computer

A dialog box will open up and show the progress of the backup BIOS overwriting the primary BIOS. This should resolve the boot loop and allow the computer to start normally.


Copy Main BIOS to Backup BIOS

Press  Alt F10  at startup to copy the main BIOS to the backup BIOS. This will keep the same BIOS version on both BIOS chips rather than the version that shipped with the motherboard.


Ethernet Port Not Working

If the onboard Ethernet port is not being detected by the operating system the Realtek RTL8111E chip can be reset by following these steps:

  1. Shut down and unplug the computer

  2. Remove the CMOS battery shown here

  3. Press and hold the power button for 30 seconds

  4. Insert the CMOS battery and plug in the computer

  5. Power on the computer and adjust the BIOS settings as necessary (they will be reset to default values)



Gigabyte Z68X-UD3H-B3 motherboard

Kexts included in the Utility and Kext Pack

Lilu plugin for audio

Unified kext, process and framework patcher


Improves compatibility with non-Apple SSDs

Enables wired networking

VirtualSMC plugin for monitoring CPU temperature

VirtualSMC plugin for monitoring fan speed

System Management Controller emulator

Lilu plugin providing various GPU fixes


Final update: September 15, 2022

This guide is no longer being updated.

Utility and Kext Pack (step 9) current for macOS Monterey 12.6 (build 21G115) with OpenCore 0.8.4