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    DirectX 12 Multiadapter, integrated GPUs and video cards together to deliver more performance

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    Judit Llordes
    @juditllordes
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    The demo engine is a modified version of the Luminous Engine that will be used in the upcoming Final Fantasy XV. The developers also made use of Nvidia GameWorks technologies.

    The video speaks for itself, but the new DirectX 12 libraries not only allow for more draw calls and better multi-threading, but also allow for display polygons six to twelve times on the screen compared to what is possible with the predecessor. There is talk of about 63 million polygons and 8K x 8K textures.


    The most interesting aspect however is a new technology call DirectX 12 Multiadapter. This solution can be used to take advantage of any "dormant" graphics chip inside a PC. Practically it will be possible to use the integrated GPU in the processor together with the dedicated video cards.

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    This modus operandi may be reminiscent of AMD's Dual Graphics feature, and in a sense it is similar, but in this case it will be possible to use more graphics resources without power limits. DirectX 12 Multiadapter technology creates a consistent link between all the GPUs available in a PC, so that all together can increase performance rendering.


    To show this solution, Microsoft made use of Epic Games' Elemental demo, based on Unreal Engine 4. First it was run on a single GTX Titan X, while subsequently using both the dedicated video card and the integrated GPU in a Intel CPU. The second configuration produced 39,7 FPS versus the 35,9 FPS achieved with the single GPU.


    DX12 Multiadapter allows developers to generate and execute commands in parallel on multiple GPUs, complete with independent memory management for each. GPUs can collaborate on rendering the same frame or do different types of work in parallel.

    The approximately 4 FPS more obtained during the demonstration are certainly not bad. There could be more depending on the game and configuration, making the difference between unplayable and playable. In recent months there have been rumors of the possible use of dedicated video cards AMD and Nvidia together, but perhaps the indiscretion was not correct and probably referred to DirectX 12 Multiadapter between dedicated and integrated GPUs.



    The words of Max McMulle, Principal DirectX Development Lead of Microsoft, published by DSOGaming do not clarify this point, they are ambiguous. Having said that, we believe that there would be possible resistance from the two companies, which perhaps could block the creation of a mixed multi-GPU configuration via drivers.

    Read also: Using all video memory in SLI or CrossFire, in the future it will be possible

    However, being able to use the graphics resources available on the PC is a great thing, and we wonder if there will be problems in a system with an AMD APU and an Nvidia GeForce video card. We'll see.

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