2018 Mac Mini [8th,6C,B] + RX 580 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 1...
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2018 Mac Mini [8th,6C,B] + RX 580 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.14.3 [briantium]  


Active Member
Joined: 3 years ago

2018 Mac Mini i7 Intel UHD Graphics 630 + Radeon RX 580 8GB + Mojave 10.14.3 [briantium]

eGPU hardware 
Sonnet eGFX Breakaway Box 550W, Red Devil Radeon RX 580 8GB, included TB3 cable

Hardware pictures (tba)

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

Benchmarks* (*also includes Radeon 570 4GB from previous build as comparison) 
Unigen Valley (Custom, Ultra, 8x Tesselation, 1440 x 900): 
Intel: 7.8 fps; 327 score
Radeon 580: 49.5 fps; 2071 score
Radeon 570: 45.1 fps; 1887

Unigen Heaven (Extreme preset):
Intel: 7.6 fps; 191 score
Radeon 580: 36.9 fps; 930 score
Radeon 570: 34.2 fps; 862 score

Cinebench Open GL:
Intel: 44.77 fps
Radeon 580: 82.45 fps
Radeon 570: 79 fps

Geekbench Metal:
Intel: 23,364
Radeon 580: 133,807
Radeon 570: 113,084

Geekbench OpenCL:
Intel: 22,679
Radeon 580: 129,045
Radeon 570: 111,351

Bruce X (FCPX):
Intel: 1:14 export not pre-rendered
Radeon 580: 21 seconds not pre-rendered
Radeon 570: 35 seconds not pre-rendered

Comments I exchanged the Radeon 570 4GB that I posted the build for last night for an 8GB Radeon 580 for the extra VRAM, plus the 8GB 580 was on sale for roughly the same price as the 8GB 570s'. 

Similar to the 570, there is not much, if any, of a drop off or even a difference between having the display connected to the eGPU versus the Mini itself. Really, it's within the margin for error, and several FCPX export tests took literally the same amount of time (BruceX for one) or were within one to three seconds of each other, some in favor of plugging into the eGPU and some for connecting to the Mini. This distinction only features in FCPX exports, as the other standard tests like Geekbench, Cinebench, Unigen Valley and Heaven all showed a clear improvement when plugged directly into the eGPU. FCPX exports were only marginally faster with the 580 versus the 570; within seconds in most cases. If it weren't for the extra ram, not to mention finding a 580 on sale in the same price range as the 570s, honestly I'd say a lot of people would be fine settling for the older card.

I did not run comparisons with my MacBook Pro 2014 via T3/T2 as I was sure the drop-off would be basically the same (35% worse) versus a T3 connection (I have a build on here for that one with the 570). 

This topic was modified 3 years ago
2018 Mac Mini [8th,6C,B] + RX 580 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.14.3 [build link]  

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Alexander Kim
Eminent Member
Joined: 3 years ago

In heaven benchmark - what resolution you had? Do you have a screenshot?

Mac mini 2018 / i7 8700b / 32GB ram / 256GB ssd