Caution: Parts of this is still a WIP. Some things may not work as expected.

GA-H87-D3H running on OpenCore 0.5.8 (Catalina)

System Specs

• Motherboard: Gigabyte GA-H87-D3H
• CPU: Intel i7 4770k
• GPU: Radeon RX580

BIOS Settings

• Bios Version: F10

BIOS Features

• FastBoot - Disabled
• Limit CPUID Maximum - Disabled
• Execute Disable Bit - Enabled
• Intel Virtualization Tech - Enabled
• Intel TXT Support - Disabled
• VT-d - Disabled
• Windows 8 Features - OtherOS Windows 8 (Booting would result in Black Screen if the HDMI port was being used with the Windows 8 option; works with OtherOS; has to do with CSM)
• CSM Support - Never
• Network Stack - Disabled

Peripherals

• Initial Display Output - PCIe 1
• PCH Lan Controller - Enabled
• XHCI Mode - Auto
• Audio Controller - Auto
• Intel Processor Graphics - Disabled
• Intel Rapid Start - Disabled
• Legacy USB - Disabled
• XHCI Hand-off - Enabled
• EHCI Hand-off - Enabled

What's Working

So far I've only tested the installation process, booting, Nvidia Web Drivers and a few other things and they're all working properly. I'll update the list after further testing.

• Installation
• Booting
• GPU / Nvidia Web Drivers
• Bootcamp
• Sleep
• Audio - Not sure - I use an USB Audio Card

How can I use this ?

You can just use the EFI folder in the repository as is to boot either a Catalina installation disk or boot into your existing Mac installation.

Do test using an USB stick before overwriting any existing Clover/OpenCore installation as issues could occur.

If you find a better configuration for these specs, feel free to make a pull request or open an issue!

Special Thanks To

• Apple for MacOS
• The OpenCore team
• InsanelyMac for a ton of helpful resources
• The InsanelyHack Discord community for help and support
• The OpenCore Vanilla Desktop Guide