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

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GeorgeBroz
(@georgebroz)
Active Member
Joined: 2 years 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: 3 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 27" iMac 5K (RP580) [7th,4C,K] + RTX 2080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  

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GeorgeBroz
(@georgebroz)
Active Member
Joined: 2 years 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: 3 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 27" iMac 5K (RP580) [7th,4C,K] + RTX 2080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  

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Eightarmedpet
(@eightarmedpet)
Noble Member Moderator
Joined: 4 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

 
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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Jyin
 Jyin
(@jyin)
Estimable Member
Joined: 3 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 27" iMac 5K (RP580) [7th,4C,K] + RTX 2080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  

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GeorgeBroz
(@georgebroz)
Active Member
Joined: 2 years 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

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: 3 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 27" iMac 5K (RP580) [7th,4C,K] + RTX 2080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  

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GeorgeBroz
(@georgebroz)
Active Member
Joined: 2 years 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: 3 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 27" iMac 5K (RP580) [7th,4C,K] + RTX 2080 Ti @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  

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