[Success] ClarkM's GA-Z170-HD3P | i7-6700 | Quadro k420 | 24GB ddr4 | High Sierra 10.13.6

Jul 24, 2011
Quadro K420
MacBook Air, MacBook Pro
Mobile Phone
ClarkM's Build:
i7-6700 - GA-Z170-HD3P - Quadro K420


Gigabyte GA-Z170-HD3P Motherboard

Already Owned

Intel i7-6700 Processor

Prolimatech Megahalems Rev.B CPU Cooler

RAM: Crucial 2x8GB ddr4

RAM: Crucial 2x4GB ddr4

NVIDIA Quadro K420 Graphics Card

SanDisk Ultra II 960GB SATA III SSD

Seagate 1TB Desktop HDD (for time machine)

ICY DOCK Dual 2.5 SSD 1 x 3.5 HDD Device Bay to 5.25 Drive Bay Converter/Mounting / Kit/Adapter - Flex-FIT Trio

Rosewill - BRONZE Series - 1000-Watt Active PFC Power Supply

Coolermaster CM690 Mid Tower Computer Case

Rosewill Card rReader

Optiarc DVD-RW Optical Drive

IOGEAR Bluetooth 4.0 USB Micro Adapter, GBU521


I was tasked with fixing a family member's 'broken' Dell Precision T3240 SFF pc. After going back and forth with them, and still encountering freezing issues, it was donated to me. I couldn't quite diagnose the problem but knew it was either a problem with CPU or motherboard. I ended up extracting a i7-6700, 2x8GB ddr4 ram, 2x4GB ddr4 ram, and a Quadro K420 low-profile GPU from it.

The CPU cooler, case, PSU, card reader, and optical drive came from my first hack build I did back in 2010 (

The SSD came from an impulse buy I did a year or so ago.

I realized I had all the parts necessary to make a fairly powerful hack with the exception of a motherboard. I did some quick research and found the GA-Z170-HD3P board works well. I picked one up for $60 on eBay.

I took a vacation day from work and did the hardware build.

My favorite thing about the build is how quiet it runs - it's completely fanless due to the giant heatsink cooler.


BIOS (hold delete key on boot):

Set the BIOS to Optimized Defaults. Then set SATA Mode to ACHI.

Disable VT-d, CFG-Lock, secure boot mode. Set XHCI Handoff to Enabled.

Create UniBeast:

Boot from High Sierra UniBeast usb (hold f12), and go through the installation process. For what it's worth, I chose to format my drive as APFS.

After macOS installation, run MultiBeast for High Sierra.

Choose UEFI Boot Mode, then drivers:

Audio -> ALC887

Network -> 811H

Then 'build' and restart.

I did the initial install with the integrated Intel graphics, then for dual monitors added K420 graphics card & installed latest Nvidia drivers. This is basically the reason why I'm still running High Sierra.

What Works:

iMessage - done per iDiot's Guide to iMessage
All other iCloud services.
Gigabit network,
Video - full acceleration thanks to Nvidia web drivers. (

Doesn't Work/Untested:

USB 3.1 Type C port on back hasn't been tested as I don't have any Type C devices.