ReBAR was enabled. He says it in the video and it's a mandatory step to do for anyone using an Intel GPU as they perform like crap without it, also shown in the video.
It's a real shame as no one is going to spend $500 on a CPU and then $250 on a GPU for gaming, and that puts the B580 a really bad spot in CPU demanding games. I don't even want to see how it would fare on a game like Civilization or Stellaris with all those background calculations.
I hope Intel find the root and manages to fix it.
Please excuse my bad English.
Currently gaming on a PC with an i5-4670k@stock (for now), 16Gb RAM 1600 MHz and a GTX 1070
Steam / Live / NNID : jonxiquet Add me if you want, but I'm a single player gamer.