Now as Microprocessor analyst, David Kanter, said, some Oculus employees told him that the best Preemption support for context switches was with AMD by far, Intel was pretty good and NVIDIA was possibly catastrophic (1:21:00 in the video below).
http://www.dsogaming.com/news/oculus-employees-preemption-for-context-switches-is-best-on-amd-nvidia-possibly-catastrophic/
An interesting interview shedding more light into DX12 'pre-emption' for context switching of shaders. Slow context switching leads to poor latency which is bad for VR.
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