Does connecting 2nd monitor to integrated GPU decrease performance?

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devor110

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I'm currently running 2 1080p monitors one is 60hz the other is 144hz. With my current available cables i can only get the second one running if i plug it into my motherboard instead of my 1070, because it only takes VGA or DVI-D, does this decrease performance?


specs:
GTX 1070
16gb DDR4
i5 6600k @4.5GHz
 
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I assume that since the second monitor only accepts VGA and DVI but you can't use it with the videocard, this means you are already using the DVI output of the videocard for the first monitor. Is that correct?

If so, maybe you can use an adapter on the videocard HDMI output to convert it to DVI, so you can then connect it to the second monitor.

I don't like using adapters, but I'd rather use an adapter than use a videocard and integrated graphics at the same time. A 1070 costs a decent chunk of money, it just seems weird to spend that money on a higher end card only to turn around and use integrated graphics again.
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Aeacus

Aeacus

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When you have dedicated GPU in the system then the on-board GPU is automatically disabled. In other words, you can't run 2x monitors at once where one is plugged to the GPU and another to the MoBo.
To get both working, they both have to connect to the same component, either GPU or MoBo where there's no GPU in MoBo.
 
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Aeacus

Aeacus

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Did some digging and that dual monitor setup is only possible IF you can re-enable the iGPU within BIOS once you have dedicated GPU in the system.
Do note that not all MoBos have that feature and it isn't possible on all PCs.

What i said earlier is also correct since BIOS will automatically disable iGPU once dedicated GPU is put in the system.

And vote down from me for 13thmonkey for failing to explain how to use dual monitor setup with GPU + iGPU combo and the limitations of this setup.
 
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dontlistentome

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I assume that since the second monitor only accepts VGA and DVI but you can't use it with the videocard, this means you are already using the DVI output of the videocard for the first monitor. Is that correct?

If so, maybe you can use an adapter on the videocard HDMI output to convert it to DVI, so you can then connect it to the second monitor.

I don't like using adapters, but I'd rather use an adapter than use a videocard and integrated graphics at the same time. A 1070 costs a decent chunk of money, it just seems weird to spend that money on a higher end card only to turn around and use integrated graphics again.
 
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Aeacus

Aeacus

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While you and 13thmonkey know how to use this setup, the explanation is for everybody else that may come to this topic in hopes to get their same setup running. Without any explanations how it's done, it isn't helpful for others and hence the vote down.

In graphical aspect, both monitors have their own GPU to power them and in that sense, there should be a slight performance increase. But since your 2nd monitor is run off by iGPU, it puts a higher load on a CPU and that can drop the CPU's performance. Without testing (benching), it can't be said for sure if this setup would drop the PC's overall performance or not.

Since you have your setup running, you can easily do some benchmarks with only one monitor running and then with 2 monitors running to see if there is any performance drops or increases.
 
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13thmonkey

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If you leave everything on auto and your mobo has the outputs and logic to use an iGPU then it will work. They are designed to be able to run at the same time. I stand to be corrected but please show me an example where it can't. I've had this question many time on here, not a single person has come back saying it wouldn't work.

Using the IGPU DOES NOT put a higher load on the CPU, the CPU is not emulating a GPU, they are separate and discrete chunks of the chip, the iGPU will generate a little more heat to be dissipated, but if you are not gaming on the iGPU this is unnoticeable.

 
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bignastyid

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I run 3 displays on my rig. 2 monitors on the 980ti and a 4k TV on the Igpu. Some boards will automatically disable the igpu when a dedicated gpu is installed but it's a simple matter of entering the bios and re-enabling the igpu for multi monitor mode to fix that. .
 
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Karadjgne

Karadjgne

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If you look at any bios, it asks for primary graphics adapter. Default being the igpu. Most bios are set for single monitor usage, it's a power saving feature as the bios will no longer spend time or energy looking for other sources. The act of adding a PEG in effect disables the igpu, there being only one monitor. If bios is changed to multi-monitor, the igpu is regulated to Secondary graphics adapter, the PEG still being Primary.
 
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