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Possible to accelerate iMac internal display with eGPU?  

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JamesSullivan
(@jamessullivan)
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Joined: 2 years ago
Posts: 1
May 13, 2017 7:35 pm  

I have a late 2015 4k 21.5 inch iMac with integrated intel graphics. These are obviously pretty bad and I can't game very well, even with lowest settings. I'm thinking of purchasing an Akitio node, but am wondering if that paired with a gpu (am thinking amd rx 460) could accelerate my iMac's internal display? I understand with macbooks you need applications (spectacle and disable display) and then you need the fake hdmi thing. My iMac doesn't have an hdmi port, just usb thunderbolt and firewire. Would the above applications still work and still get a gpu boost? Thanks in advance!

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


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patrick_steven
(@patrick_steven)
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April 13, 2019 11:42 am  

no it only works with windows laptop, as there is no HDMI interface in imac, you could try thunderbolt to hdmi convertor and check it.

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


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mac_editor
(@mac_editor)
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Joined: 2 years ago
Posts: 2048
April 13, 2019 4:18 pm  

https://support.apple.com/en-us/HT208544#apps

purge-wrangler.shpurge-nvda.shset-eGPU.shautomate-eGPU EFI Installer
----
Troubleshooting eGPUs on macOS
Command Line Swiss Knife
eGPU Hardware Chart
Multiple Build Guides
----
Current: MacBook Pro RP560X + 480/R9 Fury/Vega 64 | GTX 780/1070
Previous: 2014 MacBook Pro 750M + 480/R9 Fury | GTX 780/980 Ti/1070


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OliverB
(@oliverb)
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Posts: 1216
April 13, 2019 10:08 pm  
Posted by: patrick_steven

no it only works with windows laptop, as there is no HDMI interface in imac, you could try thunderbolt to hdmi convertor and check it.

Really?

2018 15" MBP & 2015 13" MBP connected to RTX2080Ti GTX1080Ti GTX1080 Vega56 RX580 R9-290 GTX680


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bootz
(@bootz)
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Joined: 2 years ago
Posts: 39
April 17, 2019 11:17 pm  

Your iMac CAN work with an eGPU driving the internal display. Getting it to work in macOS is tricky, but honestly isn't even worth it. If you want to game, I suggest the 1070/2070 Aorus Gaming Box and running Windows Bootcamp. You will be able to get good framerates at 1080/1152p on your internal display using Windows. 

You also CAN use the HDMI ghost plug, however the performance and lag is pretty bad in Windows 10, I'd assume it would be really bad using macOS. The way to make it work in Windows 10 is to use the built-in Graphics Switching - no HDMI trickery required. You cannot use Nvidia Optimus because the iGPU in your iMac is not compatible. The built-in switching works well, however you are limited to newer DirectX titles. Games like PUBG, Fortnite, Overwatch, etc., will work fine.  But give up on the thought on gaming on macOS. It is just terrible. You'll get a 30% bump in performance running Windows Bootcamp with the iGPU. 

This post was modified 1 month ago

iMac 4k 2015 - 21.5" (iGPU only)
i5-5675R @ 3.10 GHz
8 GB RAM
Aorus Gaming Box 1070 via TB3 > TB2 adapter
Windows 10.0.17134


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