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Solution for iMac 27” 5K – Gaming experience in Bootcamp using internal display
 

Solution for iMac 27” 5K – Gaming experience in Bootcamp using internal display  

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GeorgeBroz
(@georgebroz)
Active Member
Joined: 7 months ago
 

Hi there,
I’am looking for EGPU + enclosure for best gaming experience in BootCamp using internal 5K display (macOS support welcome). I know about bottlenecking with using internal screen. Is it possible to use one TB3 cable to feed EGPU and then second TB3 cable to feed the 5K internal display maybe using target display mode ? I would like to use latest gen. GPU as I said mainly for gaming. (Kingdom Come Deliverence)

iMac spec: 27” 5K / Core i7 (I7-7700K) 4,2GHz / 16GB / Radeon Pro 580 8GB

Please I kindly ask anyone with experience for advisory. 🙂

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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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 

The 5K iMacs do not support target display mode.

If you want to use the internal display for gaming, your only option is to game under OS X.
Under the Bootcamp, the internal display is worthless for gaming at best, non-functional for most part.

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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GeorgeBroz
(@georgebroz)
Active Member
Joined: 7 months ago
 

Is it really that bad ? I saw some vids on YouTube with iMac 5K gaming in bootcamp using internal screen.

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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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 
Posted by: GeorgeBroz

Is it really that bad ? I saw some vids on YouTube with iMac 5K gaming in bootcamp using internal screen.

You can game in Bootcamp on internal display fine. My wife does that all the time.
When you add the eGPU, you will loose the internal display and/or the dGPU.

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

The 580 in the iMac isn't a bad card to begin with, unless you are chasing 60fps in 4K just using the internal GPU will prob suffice...

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


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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 
Posted by: Eightarmedpet

The 580 in the iMac isn't a bad card to begin with, unless you are chasing 60fps in 4K just using the internal GPU will prob suffice...

Yeah, my motivation to get eGPU was triple monitor gaming and/or VR.
I was gonna use the Vega for that, but the 2080 ti fell on my lap.

I am waiting on tax return money for the Vive Pro.

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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GeorgeBroz
(@georgebroz)
Active Member
Joined: 7 months ago
 

Kingdom Come Deliverence is pretty hungry game for GPU resources...

I know that and do that now with Radeon Pro 580. I was wondering about 4K gaming

This post was modified 7 months ago

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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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 
Posted by: GeorgeBroz

I know that and do that now with Radeon Pro 580. I was wondering about 4K gaming

If you are after 4K Gaming, RTX 20-series are your only real choice.
Even the Vega FE couldn’t manage it well.
Hell, even the 2080 ti can’t do it at 60fps with extremely high graphic settings.

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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GeorgeBroz
(@georgebroz)
Active Member
Joined: 7 months ago
 

Yeah, I guess bottlenecking via TB3 will be around 30-40% 🙁

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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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 2 years ago
 
Posted by: GeorgeBroz

Yeah, I guess bottlenecking via TB3 will be around 30-40% 🙁

The over-head on TB3 isn’t that simple.
For example, I can get the Superposition bench mark to about 11500, which is on-par with other 2080 ti.
But once you move to software that rely on the data bandwidth more than the compute capacity, you will see the degrading performance due to TB3’s bottleneck. Simillar principal apply to the GPU based mining, you will see a mining rig with dozen or more GPUs, all running PCIe 1x speed.

If the game is written well, it should be doing the data-heavy activity during the loading screen, and the actual gaming should rely on the computing more.

Another factor is the additional activities you have on your system.
I noticed a funny behavior on the other day, My H2D speed was bit lower than usual with my Vega.
I realized that my iPad was backing up via USB3 point (these port in iMac should not be affecting the TB3).
Once the backup was done, the H2D number went back up.

In another words.. YMMV.

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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abelviking
(@abelviking)
Eminent Member
Joined: 5 months ago
 
Posted by: GeorgeBroz

Yeah, I guess bottlenecking via TB3 will be around 30-40% 🙁

I figured out thanks to another member how to get both dGPU and eGPU to work with internal screen. I'm on a 2015 iMAC so you might be getting better framerates.
KCD barely runs on mine and I suspect is for lack of optimization and CPU bottlenecking although I run at 2K or 2.5K (half the resolution of the iMAc to keep the aspect ratio with the internal screen).
On the other hand on similar settings Witcher 3 doubles the framerate on internal screen.
Here are your references:
https://forum.kingdomcomerpg.com/t/consistant-60-fps-on-old-system/56794 -> Kingdom Come performance issues.

https://www.nexusmods.com/kingdomcomedeliverance/mods/482/?tab=description

Internal:
https://egpu.io/forums/pc-setup/step-by-step-guides-to-install-nvidia-and-amd-egpu-cards-on-bootcamp-15-inch-macbook-2017-and-2018/

 

This post was modified 5 months ago

Sytem InfoiMAC Late 2015. dGPU AMD M390, OSX 10.12.6, Windows 17134.rs4_release.180410-1804(1803). GYGABYTE AORUS RX580 miniITX eGPU my signature


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OliverB
(@oliverb)
Noble Member
Joined: 10 months ago
 
Posted by: Jyin
Posted by: GeorgeBroz

I know that and do that now with Radeon Pro 580. I was wondering about 4K gaming

If you are after 4K Gaming, RTX 20-series are your only real choice.
Even the Vega FE couldn’t manage it well.
Hell, even the 2080 ti can’t do it at 60fps with extremely high graphic settings.

J

@jyin, a well clocked GTX 1080 Ti outperforms any RTX20-xx except RTX2080Ti. Don't you think it should be an option, too?

BTW, (for external display I have to add) I got a couple of modern games with FPS >= 60FPS or more in 5K with my GTX1080Ti. Ultra settings.

That is, e.g.: 
- Wolfenstein II New colossus
- Dreamfall Chapters
- Hitman Absolution
- Return of the Tomb Raider

see some benchmarks with GTX1080Ti and Radeon VII

as you can also see, in 4k most games are clearly over 60FPS.

Bu lowering the details I get every existing game performing 60FPS or higher in 5K. in 4K it should be >= 100FPS.  With high FPS the TB3 bottleneck comes into play, so this is not guaranteed.

(except Metro Exodus perhaps, have to try that one)

This post was modified 5 months ago

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


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