Update: I've talked to AMD about this article since it went live, and I've been informed that something isn't right here - and that the new Radeon Pro SSG will wipe the floor with NVIDIA's Quadro P6000 graphics card. AMD has promised to send me a Radeon Pro SSG when it launches to do my own in-house testing against the P6000 with real-time 8K video editing, something that is meant to be only capable on Radeon Pro SSG.
AMD debuted their upcoming Radeon Pro SSG during Capsaicin just before SIGGRAPH 2017 kicked off, with their next-gen Vega GPU architecture featuring a 2TB NVMe drive soldered to the graphics card as 2TB of massively-fast cache. Perfect, and reportedly needed for real-time 8K video editing from RED Cinema cameras... until we visited NVIDIA a couple of days later.
NVIDIA were showing off their Quadro P6000 graphics card, which has been available for months and months now, editing 8K footage from a RED camera - all in real-time, without 2TB of cache.
There were some big differences between the systems and what parts of the PC were being used, depending on the card doing the 8K scrubbing and editing. AMD's new Radeon Pro SSG was pushing nearly 5GB/sec from the SSDs on the Radeon Pro SSG, while the CPU usage was just 14% and the RAM usage only 24%. NVIDIA's system didn't need a 2TB SSD drive to reach 8K real-time editing, but the CPU and RAM usage numbers were much higher. I didn't snap a photo of this, but I remember the CPU usage getting closer to 30% while the RAM consumption ramped up to 50%.