What's the advantage of having 2 GPU's?

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NeonCore

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Jul 17, 2016
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What's the advatage of having 2 GPU? I have Intel HD Graphics 520 and Nvidia Geforce 940m why do i need another GPU if i have the current one? Is there any advantage to have 2 GPU? Can i double my performance? I know that integrated use system ram and the dedicated use its own ram but why do two GPU's exists? Many says that you can combine two Graphics card by Direct X 12 and the performance can be double but it can only works on games that supports multi-gpu and direct x 12.My Nvidia Geforce 940m and Intel HD Graphics 520 supports Direct X 12 so can i use both card at the same time?

Direct 12 Multi-GPU
http://www.pcworld.com/article/3036760/hardware/the-impossible-has-happened-radeon-and-geforce-come-together-in-directx-12.html

 
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Darkbreeze
If it was designed for it, that would be an entirely different story, and you'd know about it, because they'd offer that up as a listed feature in the units marketing materials.
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IDProG

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Jul 6, 2016
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The ONLY advantage of having more than 1 GPU is more performance. Some people are rich enough to buy 2 expensive GPUs and ready to take the risks (less than twice the performance of the single card, more power consumption). Wait, GT 940? Never heard of that. Do you mean GT 940M? Multi-GPU can only be done if, and only if, the type of the GPU is the same (for example, doing Multi-GPU with 2 GTX 980s), otherwise, you cannot. So, in conclusion, you cannot make the iGPU (HD Graphics 520) work together with GT 940M.
 
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Darkbreeze

Darkbreeze

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Jun 24, 2014
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If it IS a laptop, which I'm pretty sure it has to be, then it has two adapters because the GT 940 is probably more capable than the HD 520 adapter. The 520 adapter will be fine for less demanding tasks and will create less heat, and the GT 940 will provide a somewhat more capable solution for SOME tasks that the 520 might not be up to. So far as I know, there is no way to combine HD graphics with discreet graphics on a laptop in order to increase performance.
 
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Darkbreeze

Darkbreeze

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This is WRONG, based on what is SUPPOSED to be capable of happening with DX12 going forward. Even Nvidia and AMD cards are supposed to, at some point, be capable of being used together in a hybrid method that is not SLI and is not Crossfire, per se. At this point though, neither camp has implemented anything that allows it or indicated any actual driver support for it yet.
 
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Darkbreeze

Darkbreeze

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So then you can use one or the other, and which gets used will generally depend on the particular model's bios construct and firmware, or the driver framework. In most cases, on mobile units, the integrated graphics will be used by default unless the system determines that it's not up to the task, in which case the discreet graphics will kick in, OR, in some cases it may be possible to permanently assign the discreet graphics as the default option in either the bios or the Nvidia driver utility.
 
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NeonCore

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Jul 17, 2016
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But it is said here that you can combine Descreet with integrated, is there any possbility the Multi-GPU function will work on any loptop with direct x 12 in the future?
http://wccftech.com/directx-12-multiadapter-technology-discrete-integrated-gpus-work-coherently-demo-shows-big-performance-gains/
 
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Darkbreeze

Darkbreeze

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To begin with, I wouldn't believe WCCFtech if they said the sun rises in the east and sets in the west. Even though it does, I'd have to question it if I read it there. Further, I'd be very surprised if that wasn't limited to desktop variants only. I've not seen or read anything yet that indicated laptop integrated and discreet graphics could be combined. Probably a bad idea anyhow due to the increased heat that would be created, which would upset the delicate balance designed into laptop units when it comes to the cooling capabilities.
 
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NeonCore

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Jul 17, 2016
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Yes probably a bad idea because of the double heat of Dedicated and Integrated but what if they upgraded the loptop/unit as well for multi-adapter use that can handle both cards at the same time?
 
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