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Mac Mini 2018 + Vega 64 slow performance  

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waterchill
(@waterchill)
Active Member
Joined: 3 months ago
Posts: 17
December 14, 2018 10:37 pm  

Hi there,
my situation:

Mac Mini 2018 i7/32GB/1TB + eGPU MSI Vega 64 + Sonnet 650

All three monitors 4k hooked up to the Vega 64 Displayport

Just plugged in the eGPU restart and i'm disappointed.

First test:

Go to Google Chrome and check this link:

a) 8k video not possible to show this normal. It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

b) Starting "zwift" some will know this for cycling indoor app. It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

c) Open "Microsoft Remote Desktop" It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

What do I'm doing wrong?

With my old Mac Pro 6,1 D500  there was no problem with all these things, and the D500 is about 20% speed of the RX64 so what is the problem? I have no idea. Restarted the machine several times no improve.

MacPro 6,1 12C/64GB/1TB 2xD500
MacMini 2018/i7/1TB/32GB eGPU Vega64/Sonnet650


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waterchill
(@waterchill)
Active Member
Joined: 3 months ago
Posts: 17
December 14, 2018 10:44 pm  

In Benchmark I got this so it seems to work but only in benchmark

MacPro 6,1 12C/64GB/1TB 2xD500
MacMini 2018/i7/1TB/32GB eGPU Vega64/Sonnet650


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waterchill
(@waterchill)
Active Member
Joined: 3 months ago
Posts: 17
December 14, 2018 10:47 pm  

The screesaver is a laugh. About 2 fps max...

MacPro 6,1 12C/64GB/1TB 2xD500
MacMini 2018/i7/1TB/32GB eGPU Vega64/Sonnet650


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waterchill
(@waterchill)
Active Member
Joined: 3 months ago
Posts: 17
December 15, 2018 9:48 pm  

I found out that only the 2 screensaver „Arabeske and shell“ maxes the eGPU out. All other screensavers are fine. This also not work with 1 screen you can test it. Bug?

MacPro 6,1 12C/64GB/1TB 2xD500
MacMini 2018/i7/1TB/32GB eGPU Vega64/Sonnet650


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(@megaseppl)
Active Member
Joined: 4 months ago
Posts: 8
December 16, 2018 10:28 am  

I can't really help you... I don't even have an eGPU yet... but have you already tried the following things:

1. Does it work better if only one of the screens is attached to the GPU?
2. Did you already change the USB-C cable? Are you using a passive or an active cable?
3. Does the Graphics card work normally in a PC or in your old Mac Pro (if it fits...)?

No eGPU yet... planning to buy a Razer Core X with ASUS Vega 64 for my Mac mini


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hornedfrog
(@hornedfrog)
Eminent Member
Joined: 4 months ago
Posts: 36
December 16, 2018 8:48 pm  
Posted by: waterchill

In Benchmark I got this so it seems to work but only in benchmark

It may be a T3 cable.  Is the eGPU Thunderbolt link running at full speed/width?

Mac mini 2018/i7/1TB/32GB RAM
Sonnet Breakaway Box 650W. Sapphire Vega 64 - (21275-03-20G card)
OWC Thunderbolt 3 14 port hub
AKiTiO Node Duo, 1 x Patriot Scorch M.2 512G SSD PCI-E 3.0 x 2 drive.


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Juan C. Yunis
(@juan_c_yunis)
Estimable Member
Joined: 1 year ago
Posts: 228
January 3, 2019 11:47 pm  
Posted by: waterchill

Hi there,
my situation:

Mac Mini 2018 i7/32GB/1TB + eGPU MSI Vega 64 + Sonnet 650

All three monitors 4k hooked up to the Vega 64 Displayport

Just plugged in the eGPU restart and i'm disappointed.

First test:

Go to Google Chrome and check this link:

a) 8k video not possible to show this normal. It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

b) Starting "zwift" some will know this for cycling indoor app. It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

c) Open "Microsoft Remote Desktop" It is stuttering. GPU fans goes to full speed and GPU is maxed out. With internal graphics no problem. 

What do I'm doing wrong?

With my old Mac Pro 6,1 D500  there was no problem with all these things, and the D500 is about 20% speed of the RX64 so what is the problem? I have no idea. Restarted the machine several times no improve.

Did you figure it out? I'm experiencing the same issue.

UPDATE: I figured it out myself, for 8K videos with youtube, it only happens with Chrome, Firefox works perfect.

This post was modified 3 months ago

2018 Mac Mini Core i7 8700B 32GB RAM 512GB SSD + Razer Core X + AMD Radeon VII


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