Setup & Software Discussions
2018 Mac Mini [8th,6C,B] + RX 570 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10...

2018 Mac Mini [8th,6C,B] + RX 570 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.14.3 [briantium]  


New Member
Joined: 10 months ago

2018 Mac Mini i7 Intel UHD Graphics 630 + Radeon RX 570 4GB + Mojave 10.14.3 [briantium]

System specs
2018 Mac Mini i7, Intel UHD Graphics 630, Radeon RX 570 4GB, Mojave 10.14.3

eGPU hardware 
Sonnet eGFX Breakaway Box 550W, Radeon RX 570 4GB, included TB3 cable

Hardware pictures (tba)

Installation steps 
Plug and Play with no problems on Mac Mini 2018

Unigen Valley (Custom, Ultra, 8x Tesselation, 1440 x 900): 
Intel: 7.8 fps; 327 score
Radeon 570: 45.1 fps; 1887 score

Unigen Heaven (Extreme preset):
Intel: 7.6 fps; 191 score
Radeon 570: 34.2 fps; 862 score

Cinebench Open GL:
Intel: 44.77 fps
Radeon 570: 79 fps

Bruce X (FCPX):
Intel: 1:14 export not pre-rendered
Radeon 570: 35 seconds not pre-rendered

Comments The eGPU has definitely improved graphics performance.

What I noticed that is strange is, while I got better frames per second speeds with the display plugged into the eGPU, while rendering FCPX files (not just BruceX, but previous projects I re-exported as tests), having the display plugged directly into the Mac Mini itself resulted in slightly faster exports. Nothing crazy, but within a matter of seconds in most cases; BruceX actually rendered at 29 seconds with the display plugged into the Mini versus the above 35 seconds when the display was connected to the eGPU. Perhaps somebody has some insights as to why this might be? I ran these tests several times with the same results. EDIT: I should add that I'm connecting via HDMI to HDMI; and I did set each app to Prefer External GPU. 

Also, I ran the eGPU on my old MacBook Pro 2014 15-inch, via a TB2/TB2-3 cable, and ran purge-wrangler and purge-nvda to get it to operate...running the same benchmarks, very nearly across the board on every test, this set up, while definitely significantly faster than the Nvidia 750M that's in the 2014 MBP, was consistently about 35% slower than a T3 set up*. (ie, one project I exported that took 1:35 on the Mini with T3 cable then took 2:09 on the 2014 MBP with a T2/T3.)

(*Or is it more accurate to say the T3 set up is 26% faster? I got caught up in that distinction, lol.)

This topic was modified 5 months ago

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

Eminent Member
Joined: 2 years ago

I know this is a few months old (sorry for the necro) but I'd like to know what brand of GPU you're using? I just got my 2018 Mac mini in & I'd like to set it up with an eGPU. Thanks a ton!

2018 Mac mini: Core i3, 8GB RAM, Sonnet 350 (aftermarket 550w PSU)+XFX Radeon RX-480 8GB Black Edition
2012 Mac mini: Core i7, 16GB RAM, Toshiba 1TB SSD, Seagate 1TB HDD
Custom: Ryzen 7 1700, 16GB Corasir DDR4-3200MHz RAM, 2x Corsair 500GB Neutron SSD, Seagate 3TB SSD, EVGA Nvidia 980Ti