Question from clueless noob

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atibingler

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Oct 2, 2015
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Hey dear forum,

So I just got my desktop system to display on my living room TV.

When I play video games, the games basically show both on the TV and my PC monitor in the other room at the same time.

Since I am not looking at the PC monitor at all I'm just wondering - can you turn it off to increase performance? Isn't my gpu rendering picture for both of the monitors right now?

 
Solution
James Mason
Duplicating the display (mirroring) doesn't have an effect on performance, because the GPU isn't actually generating two images, it's just also sending the same image out on another cable.

Turning off the other monitor also won't make it not try to send an image to it, you'd have to actually unplug the monitor for the GPU to not see it.
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Mr Hat

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Yes you can turn off that laptop screen, but no, it won't increase performance since that TV screen is just mirroring the laptop screen, no second "view" has to be generated. Hope this helped :)
 
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Mr Hat

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Yes you can turn off that laptop screen, but no, it won't increase performance since that TV screen is just mirroring the laptop screen, no second "view" has to be generated. Hope this helped :)
 
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atibingler

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Alright thanks man

But btw its not a laptop. I have a dvi cable from my gpu to my pc monitor and a hdmi cable from my gpu to tv..

For real my gpu does the work only for 1 screen, not two?
 
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Mr Hat

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What do you mean, it should if that was the question. If it does not, not all GPUs (expecially the older ones) support multiple screens. And ehm, btw, don't forget to select the best answer, helps me out a lot :)
 
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king3pj

king3pj

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I'm not sure this advice is correct. If you are using multiple outputs (DVI and HDMI in this case) you are essentially running a multi-monitor setup. It should be the same as running two 1080p monitors on your desk.

The part that confuses me a bit is that you are seeing the game on both monitors. Typically if you are running multi-monitor you are either stretching the game over multiple monitors or displaying the game on one monitor and other things like a web-browser or music app on the other. It seems like you would only be getting part of the image if the game is displaying on both screens at once.

Driving a second monitor probably does have some effect on performance but I'm not sure how big the impact would be. Plenty of people do it to multi-task while they have a game open.
 
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James Mason

James Mason

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Duplicating the display (mirroring) doesn't have an effect on performance, because the GPU isn't actually generating two images, it's just also sending the same image out on another cable.

Turning off the other monitor also won't make it not try to send an image to it, you'd have to actually unplug the monitor for the GPU to not see it.
 
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