One of the biggest features you will see talked about with DirectX 12 is asymmetric multi-GPU, which lets you mix and match different GPUs from both AMD and NVIDIA as long as they support a consistent feature-level. In the case of “Ashes of Singularity” that is Direct3D 12_0. In order for this to work you need two DirecX 12 graphics cards and of course a DirectX 12 application, don’t expect this to work on DirectX 11 games. Anandtech put the asymmetric multi-GPU to the test by building a multi-GPU setup using a Radeon R9 Fury X and a GeForce GTX 980 Ti.
For starters alternate-frame rendering does work, which is the most common multi-GPU method. Anandtech did see >50% performance gains, but nothing close to what you would expect from the proprietary multi-GPU configurations we are used to like SLI or CrossFire. Another interesting thing is that the primary impacts performance. Anandtech’s findings shows that if t hey had the Fury X is the primary (plugged into the display) and the GTX 980 Ti as secondary it yielded better results than the other way around.
Even better is that Anandtech found no stability issues in mixing the R9 Fury X with the GTX 980 Ti. It will be interesting to see how long this will remain stable as GPU vendors could see this competing with their multi-GPU optimization standards.
Source: Anandtech | News Archive