macmini 2018 egpu bootcamp error 12 simple fix.
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macmini 2018 egpu bootcamp error 12 simple fix.  


New Member
Joined: 2 months ago

So I have been trying for 2 days to get my egpu to work on bootcamp. Searched all over the net no answer.

Solved it, for some reason I need to have a second monitor connected to the macmini hdmi port at the same time as the egpu. Don´t need the efi boot crap or anything. Just works. Don´t need it in MacOs though.

Anyway hopes this help if some have the same problem.

macmini 2018, egpu razer core, amd r 5700 xt

I use windows 1809 and use windows update but do not install 1909 vers as this will break the egpu.

After I installed and updated windows I turn on the egpu let windows install drivers and then install the amd drivers and restart. First reboot always fails, reboot again and it works.

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts

itsage liked
Eminent Member
Joined: 10 months ago

Yes, I’ve been doing this with an adapter going to the second input (DVI) on my monitor.

A tip, if you disable FileVault it will boot first time into macOS or Windows flawlessly. Every single time.

Here’s the adapter if anyone is interested. Not cheap, but the best.


Windows 10 1809 is a requirement which unfortunately will be problematic once May comes around as Microsoft are dropping support. The Insider track of 2004 is looking promising and some are saying the error12 issue is fixed but we’ll have to wait for RTM and see.

Mac mini 2018, i7 3.2GHz 6c, 32GB RAM, 1TB SSD, 10GbE, Sonnet eGFX 350W (Noctua NF-A12x25 ULN) + PowerColor RX 5700 XT 8GB, TEKQ Rapide TB3 1TB SSD, macOS Catalina, Win10 Pro
Mac Pro 2010, X5690 3.46GHz 6c, 64GB RAM, Samsung SM951 512GB, Sapphire Pulse RX 580 8GB, Intel X540-T1 10GbE, Allegro Pro USB 3.0, AC/BT 4.2, macOS Mojave