2017 iMac 5k 27inch RP580 TB3 + Vega FE-LC & RTX2080Ti @32Gbps-TB3 (Sonnet Breakaway 550) + macOS10.14 & Win10 [jyin]  

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Jyin
 Jyin
(@jyin)
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Joined: 1 year ago
Posts: 136
December 8, 2018 11:53 pm  

System specs.

2017 iMac 5K 27’
OS X with Vega, and Win10 with 2080 ti 

 

eGPU hardware

For Vega Fronteir Edition, Liquid Cooled
Sonnet BreakawayBox 550, replaced the PSU with EVGA SuperNOVA 850 T2, externally placed. Removed the exhaust fan.
Added two Noctua NF-F12 PWM at exhaust port for better cooling.

For the RTX 2080 ti
Sonnet BreakwayBox 550, only using the PCB and fan from it. Transplanted them into a Mini ATX case.
Using a Seasonic Prime 850 Titanium SSR-850TR 850W 80+ Titanium to power it.

Hardware pictures

This is how I set up the Vega FE/LC. With this PSU, the fan will not kick in even under high load.
The extra exhaust fan helps cooling the Vega well to the point that I don’t hear the GPU fans even under load.
It’s ugly as sin, but it’s very very quiet.

On the other hand, the RTX 2080 was a challenge.
It’s a 2.75 slot card. Not to mention it’s very long.

This won’t work.. but I knew that. I have a plan.


Installation steps

For OS X Mojave, Vega is flawless. It drives the 3x LG 27UD68s without any issues.
It is plug-and-play. The OS X don’t even care which TB3 port I used.
I used the one closer to the USB ports (bit about this later, in Win10 section)
I’ve also patched the plist in the kext to give the Vega better fan control and slight over clocking (to 1642MHz/1150mV, Memory: 1045MHz/1075mV)

The Vega works well on Win10 as well. As long as you disable the RP580 dGPU, and use the TB3 port closer to the Ethernet.
You can still use the internal display at 4K resolution, un-accelerated. 
I had the Vega in 3x Eyfinity config, and OC’ed to 1700.

I had this running for a year now.

Then..... RTX 2080 ti came today.
Obviouslty OS X is no-go for Nvidia, not for Mojave, not for RTX 20’s.
On the Win10, it’s a bit better story.
I had problem with Win10 using the TB3 port next to the USBs, which is still the case with RTX 2080 ti.
I also had problem with the driver installations, DDU is your friend here.
I still had to disable the dGPU, figures.
The iMac boots up into Windows using the internal screen, but during the swilling circle phase, it switches to eGPU.
At that point, the internal display is worthless, you can’t even use it un-accelerated. It has stuck windows logo.

 UPDATE: I was able to get rid of the Windows logo, by enabling the dGPU and installing the Bootcamp-driver.
It’s still un-usable, but at least it’s black.

Nvidia’s surround display works, but not as nice as the AMD’s Eyfinity.

Benchmarks 

RTX 2080 ti under Win10

Comments 

This build gets me best of both worlds... But my wife rolls her eyes at me.
It *might* be a *slight* over-kill...

 

2017 iMac 5k 27inch RP580 TB3 + Vega FE/LC + Sonnet 550 + EVGA GeForce RTX 2080 Ti FTW3 ULTRA GAMING + Sonnet 550 + Mac/Win10


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rubycrow
(@rubycrow)
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Joined: 2 months ago
Posts: 14
December 9, 2018 5:39 am  

You sir deserves a like for utilizing a PC case. I might end up just getting an Micro ATX case as well before scratching my head-off trying to find an enclosure that can do 3-slot.

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


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OliverB
(@oliverb)
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Joined: 3 months ago
Posts: 341
December 9, 2018 8:35 am  

While with the Vega you *have* to disable the dGPU in order to have an internal display, this is different with the Geforce: You can run the dGPU, if you hotplug the eGPU, but on the long run, die dGPU disabled is the easier choice, only if you need the dGPU or the internal display accelerated you can enable it again.

2018 15" MBP & 2013 13" MBP connected to RTX2080Ti GTX1080Ti GTX1080 Vega56 RX580 R9-290 GTX680


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OliverB
(@oliverb)
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Joined: 3 months ago
Posts: 341
December 9, 2018 10:27 am  

Another, more personal question: Are those little figures on your cupboard yours or your wife's? My wife is asking... 😉

2018 15" MBP & 2013 13" MBP connected to RTX2080Ti GTX1080Ti GTX1080 Vega56 RX580 R9-290 GTX680


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Jyin
 Jyin
(@jyin)
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Joined: 1 year ago
Posts: 136
December 9, 2018 4:33 pm  

Yeah I figured out I can enable the dGPU with nVidia in Win10.
But internal display still do not work. It is at least blank/black now.

Hot-plugging the eGPU does not work for me, when I do it after the Windows boots.
I hear I should try it when the Win Logo comes up, but I really don't need it. So I never tried that.

Figures are mine 🙂
My wife has her own set of them. You can see her side of the desk in one fo the pictures, the left hatch is hers. Note her stuffed dragons and Disney figures are threatening Vador.
My house is filled with them, as. you can see.

J

2017 iMac 5k 27inch RP580 TB3 + Vega FE/LC + Sonnet 550 + EVGA GeForce RTX 2080 Ti FTW3 ULTRA GAMING + Sonnet 550 + Mac/Win10


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OliverB
(@oliverb)
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Joined: 3 months ago
Posts: 341
December 9, 2018 9:38 pm  

After enabling the dGPU, you have to boot and then hotplug the eGPU some time when the dots are circling. With external display, the internal display acceleration is only needed for benchmarking reasons, or if for some non-gaming task, you want to have the dGPU-Power, too.

2018 15" MBP & 2013 13" MBP connected to RTX2080Ti GTX1080Ti GTX1080 Vega56 RX580 R9-290 GTX680


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GeorgeBroz
(@georgebroz)
Active Member
Joined: 2 weeks ago
Posts: 5
January 5, 2019 9:25 pm  

So you were unable to use 2080 EGPU with internal Screen in bootcamp right ? 🙁

iMac 27” 5K / Core i7 (I7-7700K) 4,2GHz / 16GB / Radeon Pro 580 8GB
MacOS Mojave / Windows 10
Not owning any eGPU yet


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