What demos? The Prey demo was on two RX's.
Auto correct does not confuse above and about, not on my phone.
It bloody should run comfortably over any single GPU as they were running two of them.
They also ran a Blender test with 4 GPUs, on Threadripper. Seems that, and the Prey one was about Threadripper being able to handle multiple GPUs / IO configs.
I thought that Prey one was out of place for that for though, and AMD's one marketing person tweeted Prey was running on 4 GPUs as well, and Raja had to correct him.
They need to sort out those marketing folks.