2018 Mac Mini [8th,6C,B] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X) + macOS 11.6 &...
 
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2018 Mac Mini [8th,6C,B] + RX 5700 XT @ 32Gbps-TB3 (Razer Core X) + macOS 11.6 & Win10 21H2  

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(@koncept_zero)
Trusted Member
Joined: 3 years ago
 

System specs

2018 Mac Mini
3.2 GHz Six-Core Intel Core i7
64 GB Ram
256 TB internal SSD
macOS Monterey 12.3.1 and all still works fine

eGPU hardware

Razer Core X
XFX AMD Radeon 5700xt THICC III
Razer Core X supplied TB3 cable
Display port cable to LG 32" 4k monitor

Installation steps

None, natively supported by MacOS
Connected TB3 cable to TB3 port next to Ethernet port on mini

Windows

I fiddled with this for about a week. I read some posts that said the 2018 Mac mini is super easy and I followed those guides to a T. Nothing worked until I disabled the PCIe x 16 in device manager. Steps I took are below. I'm confident even the newest version of windows will work with this setup with disabling PCIe x 16.

1. Installed Windows 10 Pro 21H2 (newest version as of 11/24/21 via bootcamp onto internal ssd with 60gb's of storage allocated.
2. Installed all bootcamp drivers while connected to monitor via HDMI.
3. During this whole process eGPU was connected but turned off. Make sure all other drives are disconnected until you e finished this guide.
4. Computer will download a bunch of stuff and ask for a restart. Once restarted, create a restore point and disable automatic windows updates.
5. At the windows login screen turn on egpu but remain connected via HDMI. Once logged in, verify the egpu is connected via device manager.
6. Let windows download drivers for the 5700xt.
7. You can skip the DDU stage.
8. Download official radeon drivers for this card and make sure to check the box that says something about doing a clean AMD driver install.
9. Install drivers. It will ask for a restart. When computer is powered down for a couple seconds in-between restarting and starting back up, turn eGPU off.
10. At windows login, turn eGPU back on and leave it on and connected for the remainder of this process.
11. AMD drivers should resume installing. If not, restart at step 9.
12. Once AMD drivers resume installing, it will likely give you an error message. That's ok. At this stage I also installed the HackFlags mod but don’t restart just yet.
13. Go into device manager, find your intel gpu, right click and disable it.
14. Look for the pcie x 16 controller inside device manager. Rick click and disable it.
15. Restart, but before it restarts unplug the HDMI cable but do nothing to the eGPU...leave it on and connected.
16. When it powers back up, you should see the windows login screen within a minute as the mini is now sending the signal to the eGPU and your monitor will automatically switch to the active input.

I then plug in all external drives at this point. I can easily go back and forth to windows/macOS without any trouble or weird steps.

This topic was modified 3 months ago
2018 Mac Mini [8th,6C,B] + RX 6800 XT @ 32Gbps-TB3 (Razer Core X) + macOS 12.3.1 & Win10 21H2 [build link]  

nando4 and itsage liked
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(@koncept_zero)
Trusted Member
Joined: 3 years ago
 

I updated my original post. The newest version (21H2) of windows works with my steps. 

2018 Mac Mini [8th,6C,B] + RX 6800 XT @ 32Gbps-TB3 (Razer Core X) + macOS 12.3.1 & Win10 21H2 [build link]  

itsage liked
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 M B
(@m_b_1)
New Member
Joined: 7 months ago
 

Thanks for documenting this. Can confirm this worked for me with a 2018 i7 Mac Mini and an RX 5700 XT

Only hiccup I had was not waiting long enough at the log in screen for it to recognize the card was attached so it failed the first time, but worked the second time after leaving it at the log in screen for a while to make sure it connected. 

I’d done a build on a 2019 MBP 15” and tried to use some of the old windows build techniques without success.  It’s nice to know this works on Win 1021H2 and not have to rely on an old build.

A couple of questions:

Do you think this build process would work on the MBP now? Or is there something about the Mac Mini that makes this unique?

I have a RX 6800XT and a Core X Chroma that I’d like to use on this machine occasionally (and still have the ability to use the RX 5700). How would you recommend this second card be installed?

Thanks again for the build guide - such a life saver. 

 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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(@koncept_zero)
Trusted Member
Joined: 3 years ago
 

@m_b_1, I’m so sorry I haven’t been on the forums in months. The mbp is a totally different animal and will require different steps. But I’m glad my original guide was helpful with your mini. 

 

2018 Mac Mini [8th,6C,B] + RX 6800 XT @ 32Gbps-TB3 (Razer Core X) + macOS 12.3.1 & Win10 21H2 [build link]  

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