iMac 5K late 2014, Win10 Bootcamp, internal display lag issue when eGPU is conne...
 
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iMac 5K late 2014, Win10 Bootcamp, internal display lag issue when eGPU is connected  

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yellowsub
(@yellowsub)
Active Member
Joined: 4 years ago
 

My set up is iMac 5k late 2014, Akitio Node, MSI GTX980Ti. More info can be found here: https://egpu.io/forums/pc-gaming/imac-5k-late-2014-akitio-node-gtx-980ti-external-monitor/

The GTX980Ti is powering the external monitor, and the internal M295X is powering the 5K display.

There is a lag issue with this two display/GPU set up on Win10 Bootcamp:

1) When the eGPU is connected (even when idle), the 5k display becomes quite laggy. I have to decrease the desktop resolution to 1440p to achieve an "acceptable" level. But it is still noticeable.

2) If I play Youtube video on the 5K display, the external display also becomes a little bit laggy, although not as serious as the 5K display.

3) The external monitor has no lag at all when the 5K display/internal GPU is idle.

Are there any possible solutions/ explanations to this problem? I was hoping to use the external monitor/eGPU for gaming, while the 5K display can be used for other thing as its image quality is way better. Thanks in advance for help!

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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moonbuilt
(@moonbuilt)
Active Member
Joined: 4 years ago
 

I have the same issues on my iMac 5k late 2015/AORUS GTX 1070 Gaming Box in both W10 (version 1703) and macOS (10.12.6). I can't stand the lag and switch to the external monitor entirely when using the eGPU. I've only had this setup up and running for a day or so and will report back if I find a solution. So far, lowering the resolution or just using the external display seems to be the way to go.  

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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