He's not completely knowledgeable on the power consumption, as he's unaware that the S9 has 3 boards and the R4 has 2 boards so when he calculates that increase in power he's doing it assuming the R4 has 3 boards also (actual increase should be about 67watts, not 103watts, so about 915watts = 1,000+ watts at the wall).
Careful with this video, about 1/2 through he changes his audio settings and you might blow your speakers if the volume is too high. https://www.youtube.com/watch?v=Qv7c3BWtvZk
Here's his results when he pushes it to 700M (he's not aware that you need to let it settle and run for a while to see a result on a lower speed and that you need to watch the HW errors to see if it's working OK): https://www.youtube.com/watch?v=HCTAKIQSkVc
Will Batch 2 of the R4's have the autotune feature the new S9's have?
I got 1 since I am not sure of the answer to your question