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Jake G
(@jake_g)
Active Member
Joined: 10 months ago
 

I want to use my laptop display as a second monitor when I’m gaming on the external display.

Does this impact the eGPU performance or worsen any bottlenecks?

2019 Razerblade Stealth (-8565U with mx150 and 4K screen)

Razer Core X (w/ 5700xt

 

 

 

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)
Founder Admin
Joined: 4 years ago
 

@jake_g, No impact on the eGPU performance at all. I do this with all of my eGPU setups. The laptop internal display is running activity monitor utility while the eGPU is powering the external monitor to play games. If you have an dGPU with the same brand as eGPU, it's best to disable it in Device Manager so that the Intel iGPU handles internal display.

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2020 13" MacBook Pro [10th,4C,G] + RX 6700 XT @ 32Gbps-TB3 (CM MasterCase EG200) + Win10 1903 [build link]  


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odin
 odin
(@odin)
Estimable Member
Joined: 3 years ago
 
Posted by: @jake_g

I want to use my laptop display as a second monitor when I’m gaming on the external display.

Does this impact the eGPU performance or worsen any bottlenecks?

2019 Razerblade Stealth (-8565U with mx150 and 4K screen)

Razer Core X (w/ 5700xt

It doesn't seem to make a HUGE impact for me on my Gram 17, is the 2019 stealth the one with the 28W i7-1065G7? You have much more CPU performance available to you than I do in that case with an 8th gen 15W i7-8565U. There will be some small amount of CPU used with Windows keeping track of multiple desktops, and obviously the overhead of whatever apps you are using on the 2nd monitor having to be drawn and updated as well as their CPU usage generally.

The thing I notice more often than not is when I'm switching between extending my desktop and just using only the 2nd monitor that sometimes I'll start seeing massive choppiness in rendering of just Windows itself. I don't know exactly what causes the problem to manifest and it doesn't happen all the time. Like sometimes I'll just switch between extended and display 2 (external) only and the rendering of just moving windows around on the desktop is super choppy even though I have it on external monitor only. Must be some thunderbolt sync problem or windows bug. Usually if I am gaming I'll configure the displays to just use the external monitor and reboot before gaming. It's a little bit of a pain in the rear, but I really don't need to use two monitors for any reason as I really don't care to watch performance stats, streaming or something I'm 99.9% of the time just playing a single player game. I also find it a pain to try to task switch during some games, using borderless window fullscreen modes seem to fix that often but it still is a little awkward in games that don't like to be task switched. My 15W CPU needs so much help that I tend to only run the apps that are completely necessary while gaming (such as Steam, EGS, Galaxy, Battle.net or whatever.. ).

I would just try out different things and run benchmarks etc.. to see what kinds of drop in performance you have. There's no getting away from the fact that it WILL use some additional CPU running other apps in a separate desktop. Whether it impacts anything noticeably is another matter that you might have to just experiment with and figure out for yourself. It also could just vary game by game and also depending on what apps you're trying to keep in focus on the internal monitor.

LG Gram 17 | Sonnet Breakaway Box 550 | Asus Strix RTX 2070 OC Edition | Win 10 Pro 20H2 + Fedora 32 Dual Boot
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2018 17" LG Gram 17 [8th,4C,U] + RTX 2070 @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  


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odin
 odin
(@odin)
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Joined: 3 years ago
 
Posted by: @itsage

@jake_g, No impact on the eGPU performance at all. I do this with all of my eGPU setups. The laptop internal display is running activity monitor utility while the eGPU is powering the external monitor to play games. If you have an dGPU with the same brand as eGPU, it's best to disable it in Device Manager so that the Intel iGPU handles internal display.

Your setups always look nice and clean.

How is Cyberpunk 2077 on the Dash while using eGPU? Do you see stuttering performance in the high density areas of the city when driving around? That was my main problem with it. Even with an external monitor I think my 15W cpu was no match for it. I'd get some bad performance when driving around some of the very busy areas of the city, where you could hear the audio stuttering even. Things were fine outside of those areas though.

LG Gram 17 | Sonnet Breakaway Box 550 | Asus Strix RTX 2070 OC Edition | Win 10 Pro 20H2 + Fedora 32 Dual Boot
Build Link

 
2018 17" LG Gram 17 [8th,4C,U] + RTX 2070 @ 32Gbps-TB3 (Sonnet Breakaway 550) + Win10 [build link]  


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itsage
(@itsage)
Founder Admin
Joined: 4 years ago
 

@odin, It's running smooth on this ASUS TUF F15. I keep an eye on the Armoury Crate utility screen on the internal monitor. The average temps for both CPU and eGPU are in mid 60s Celsius degrees. I have the same LG Gram 17 as yours and believe the 15W CPU and its cooling system may not be up to the tasks in some scenarios.

 

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external graphics card builds
best laptops for external GPU
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2020 13" MacBook Pro [10th,4C,G] + RX 6700 XT @ 32Gbps-TB3 (CM MasterCase EG200) + Win10 1903 [build link]  


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ha1o2surfer
(@se12897)
Trusted Member
Joined: 4 years ago
 

@odin, I get that choppyness too. The way I avoid it is to make sure the laptop is booted up with the display closed (so the iGPU never sees any activity to begin with) then switch to dual display. The minute the iGPU is powered up first, THEN the eGPU, I get that choppyness. 

 

2020 13" HP EliteBook 830 G7 [10th,6C,U] + RTX 2070 @ 32Gbps-TB3 (AORUS Gaming Box) + Win10 20H2 [build link]  

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