Use iGPU and GPU at the same time

poseidon2399 · Aug 19, 2016

I've heard that directX12 can use multiple gpu's at the same time.

I have a gtx 960 and intel hd 530 which both support directX12.

I've got rise of the tomb raider which I heard is the only one of the two games that support this kind of thing.

But.. how am I supposed to make this work?

ryguybuddy · Aug 19, 2016

No. That means you can use two GTX 1080s in SLI, etc. Not IGPU and GPU. I think AMD does support Hybrid Crossfire with their APUs and their GPUs though

Rogue Leader · Aug 19, 2016

Looking at Rise of the Tomb Raider while the latest update says Multi-GPU support it also specifically names SLI and Crossfire which tells me that Multi-Adaptor which is the DX12 feature you're asking about is not what they are supporting.

Supposedly its still only AoTS that supports this, and I haven't heard of anyone getting it working with iGPU and a GPU despite that being listed originally as supported. They may have dropped that support, but I do not know for sure.

turkey3_scratch · Aug 19, 2016

Rogue Leader :

In the settings it says "Make sure to disable your integrated GPU drivers since it can cause conflict" or something along those lines. It says only similarly-performing GPUs work; hence why my 750Ti failed to work with my R9 390.

poweruser_24 · Aug 19, 2016

The power of google brings you http://www.pcgamer.com/directx-12-will-be-able-to-use-your-integrated-gpu-to-improve-performance/

Which indicates, that yes, in certain circumstances you will be able to use MultiAdapter, and utilise your IGPU alongside your more powerful AMD/NVidia GPU. The performance increase will be negligible.
In order to do so, it is apparent that the game would need support for Explicit MultiAdpater using Unlinked GPU's, and will require a certain amount of coding support from the game developer, potentially for a scenario with the least benefit. It may also require a specific profile setting in the main graphics card driver profile for that game.

The details on the ROTR patch only appear to include Crossfire/SLI and Linked Adapters (they refer to AsyncCompute with AMD GCN1.1 and Nvidia Pascal cards - i.e. a specific pairing of tech). No Unlinked mode mentioned.

Rogue Leader · Aug 19, 2016

turkey3_scratch :

Right I knew I remembered that from somewhere, thats why they dropped the iGPU support because its so far off any good discrete GPU, and the lack of dedicated memory.

poseidon2399 · Aug 20, 2016

Rogue Leader :

turkey3_scratch :

Right I knew I remembered that from somewhere, thats why they dropped the iGPU support because its so far off any good discrete GPU, and the lack of dedicated memory.

But my gtx 960 is only 6 times better than my intel hd 530 according to passmark.

Rogue Leader · Aug 20, 2016

6 times better is a huge amount.

The feature does not work in Rise of the Tomb Raider anyway, the multi-gpu support they added was for Crossfire and SLI not Multi-Adaptor which is what you are looking for. Thats still only Ashes of the Singularity that supports it. This support for iGPUs for this feature was dropped.

poseidon2399 · Aug 20, 2016

Rogue Leader :

Is there any chance we ll see something like that in the future?

Rogue Leader · Aug 20, 2016

I doubt it, the feature functioned in testing but GPUs continue to be far more powerful than integrated graphics, integrated graphics have slower non-dedicated memory. Intel tested it and said its not worth it so I doubt you will ever see a return to it.

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