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iMac 2011 21,5" and the plan to install Mojave/Calatina using egpu
 

iMac 2011 21,5" and the plan to install Mojave/Calatina using egpu  

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zywiec
(@zywiec)
New Member
Joined: 1 month ago
 

Dears,

I would like to use egpu and upgrade MacOS 10.13 (High Sierra) to newer. Is it possible? I have read many posts on this forum but I could not find the answer. Please support. I plan to buy CoreX and the cheapest possible Radeon (Vega possible).

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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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

@zywiec According to https://support.apple.com/en-gb/HT201634 , your iMac is the iMac12,1

According to the following pages, it is possible to upgrade to Mojave or Catalina, but it might not be a good idea because of the GPU in the iMac.
http://dosdude1.com/mojave/
https://forums.macrumors.com/threads/macos-10-14-mojave-on-unsupported-macs-thread.2121473/
http://dosdude1.com/catalina/
https://forums.macrumors.com/threads/macos-10-15-catalina-on-unsupported-macs.2183772/

You might be able to replace the AMD Radeon 6xxx in the iMac with a different MXM card.
https://forums.macrumors.com/threads/2011-imac-graphics-card-upgrade.1596614/

What might be cool is a MXM to PCIe adapter instead of using a Thunderbolt eGPU. I don't think it exists and you would probably need to cut a hole in the iMac to connect it. It's unclear if it would allow the internal display to work.
http://www.sourninja.com/dualwield/

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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zywiec
(@zywiec)
New Member
Joined: 1 month ago
 

@joevt Thank you for this information. Let's drop the idea with MMX to PCIe adapter. The project you mentioned was a kickstarter.  

MXM replacement will bring a lot of problems I guess. I had read the forum thread you put and this a long story. I am afraid I break my iMac

Summarizing. It is not possible to use a setup? iMac 12,1 updated to Mojave and then eGPU via TB1?

 

 

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


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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

@zywiec

Read the dosdude1 guides. Read the first posts of the Mac Rumors threads. They suggest to disable the AMD dGPU by following the instructions at http://dosdude1.com/gpudisable/

Once you have Mojave or Catalina installed, you can try the steps to enable eGPU from Thunderbolt 1.

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 3 years ago
 

@joevt

iMac with discrete GPU does not have mux (and hence “no iGPU” even if hardware is present) so your recommendation will not work. The dosdude link is for MacBook pros only (that have dual GPU and mux) and it is the same technique I have been using in purge-nvda.

@zywiec

I suggest sticking to High Sierra with community eGPU support. Dosdude support alongside eGPU patches (even if you got Mojave/Catalina working) was also discussed here: https://github.com/mayankk2308/purge-wrangler/issues/28

This post was modified 3 weeks ago

purge-wranglerpurge-nvdaset-eGPU
2018 MacBook Pro 15" RP560X + RX 5700 XT (Mantiz Venus)


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joevt
(@joevt)
Prominent Member
Joined: 2 years ago
 

@mac_editor

Right. I missed the part where it says "You CANNOT disable the AMD GPU in an iMac". So I guess you need to stick with High Sierra until an MXM option appears (which may be never).

I saw this video for working with the MXM card. Extreme:

Rominator was looking at MXM Mac rom for some nvidia card but didn't finished it:
http://forum.netkas.org/index.php/topic,13815.60.html

 

Mac mini (2018), Mac Pro (Early 2008), MacBook Pro (Retina, 15-inch, Mid 2015), GA-Z170X-Gaming 7, Sapphire Pulse Radeon RX 580 8GB GDDR5, Sonnet Echo Express III-D, Trebleet Thunderbolt 3 to NVMe M.2 case


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