Best way to connect an LG Ultrafine monitor to an EGPU enclosure?
 
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Best way to connect an LG Ultrafine monitor to an EGPU enclosure?  

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jtarr523
(@jtarr523)
Active Member
Joined: 3 years ago
 

I'm currently doing some research on eGPUs and I'm interested in testing them out eventually once I gather enough information for the setup I want to do with it. I have a 2016 MacBook Pro 2.9Ghz Radeon Pro 460 currently and use it with my LG Ultrafine 4K monitor.

I'm looking to add a little bit more juice of course for gaming and I want to use this monitor (or at least am planning to) as the primary screen. I was wondering if it's possible to connect an eGPU enclosure to my monitor? The Ultrafine monitors obviously only have all USB-C ports. So in theory, in order to connect a graphics card to the display via an eGPU enclosure, would I need to get a DisplayPort to USB-C or HDMI to USB C?

Another option is to use the MacBook Pro as a bridge, but I've read that setup would bottleneck the eGPU connection. If I went this route, how much of a performance drop would I see?

Thank you for your time.

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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itsage
(@itsage)
Illustrious Member Admin
Joined: 4 years ago
 

The only sure way with confirmation of success is with the use of a headless ghost display adapter. However, it's worth trying a USB-C to DisplayPort cable. These cables are advertised as USB-C to DisplayPort monitor but if you can get it to work the other way around, that would be the best way.

Late 2016 MacBook Pro «» Thunderbolt 3 cable «» eGPU «» DisplayPort to USB-C Cable «» LG Ultrafine 4K

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2020 13" MacBook Pro [10th,4C,G] + RTX 2080 Ti @ 32Gbps-TB3 (AORUS Gaming Box) + Win10 2004 [build link]  


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jtarr523
(@jtarr523)
Active Member
Joined: 3 years ago
 

Thanks for the reply. I'll try that method, but if I were to try the other method (i.e. with the headless ghost display adapter), would I suffer the same performance loss if I just did it with an internal display?

Also, using this headless ghost method, do you still think I can get comfortable framerates (around 50-60fps) on AAA titles for 1080p (or 1440p for that matter) if I were to use a GTX 1080 or 1080 ti as my GPU for an enclosure?

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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Eightarmedpet
(@eightarmedpet)
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Joined: 3 years ago

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JonRoth
(@jonroth)
Active Member
Joined: 3 years ago
 

Bump!

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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willian
(@willian)
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Joined: 3 years ago
 

I'm awaiting for a test as well:

https://egpu.io/forums/mac-setup/lg-ultrafine-5k1080tiawful-performance-game-benchmarks/paged/2/#post-22284

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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Eightarmedpet
(@eightarmedpet)
Noble Member Moderator
Joined: 3 years ago
 

I've been using my Ultrafine plugged into my MacBook and the eGPU powers games just fine...

2017 13" MacBook Pro Touch Bar
GTX1060 + AKiTiO Thunder3 + Win10
GTX1070 + Sonnet Breakaway Box + Win10
GTX1070 + Razer Core V1 + Win10
Vega 56 + Razer Core V1 + macOS + Win10
Vega 56 + Mantiz Venus + macOS + W10

---

LG 5K Ultrafine flickering issue fix

 
2017 13" MacBook Pro [7th,2C,U] + RX 5700 XT @ 32Gbps-TB3 (Mantiz Venus) + macOS 10.15.4 & Win10 2004 [build link]  


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Eightarmedpet
(@eightarmedpet)
Noble Member Moderator
Joined: 3 years ago
 

I have a feeling those adapters (USB-C to DisplayPort) are not reversible.... may buy one just for fun if no one else has given it a go or is more sure they wont work?

2017 13" MacBook Pro Touch Bar
GTX1060 + AKiTiO Thunder3 + Win10
GTX1070 + Sonnet Breakaway Box + Win10
GTX1070 + Razer Core V1 + Win10
Vega 56 + Razer Core V1 + macOS + Win10
Vega 56 + Mantiz Venus + macOS + W10

---

LG 5K Ultrafine flickering issue fix

 
2017 13" MacBook Pro [7th,2C,U] + RX 5700 XT @ 32Gbps-TB3 (Mantiz Venus) + macOS 10.15.4 & Win10 2004 [build link]  


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willian
(@willian)
Active Member
Joined: 3 years ago
 
Posted by: Eightarmedpet

I have a feeling those adapters (USB-C to DisplayPort) are not reversible.... may buy one just for fun if no one else has given it a go or is more sure they wont work?

I won't say this would work since Ultrafine 4k requires a USB-C running a Displayport over USB stream and an ordinary USB as well, may be for brightness control communication or USB Audio or any other purpose.

No matter what the purpose is, The display won't light up unless there exists such link to communicate with an OS, and this link wouldn't have chance to be routed on DP port because no protocol exist describes such implementation. Even if the headless adaptor managed to push a USB link into DP port, your graphic card wouldn't add that USB stream to DP at the first place.

So what is close to it, is to implement something like this:

(USB , Displayport) -> USB Type-C /w alt mode

 In terms of the protocol they are using, not the port. 

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

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Humanovation
(@humanovation)
Eminent Member
Joined: 3 years ago
 
Posted by: Eightarmedpet

I have a feeling those adapters (USB-C to DisplayPort) are not reversible.... may buy one just for fun if no one else has given it a go or is more sure they wont work?

Tried it ... doesn't work.  I am having the same issue ...

 

2017 15" MacBook Pro (RP560) [7th,4C,H] + RX 580 @ 32Gbps-TB3 (Sonnet Breakaway 550) + macOS 10.13 & Win10 [build link]  

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