ASUS MX299Q 29-Inch Ultra Wide LED-Lit Monitor

In this gear rundown video by PewDiePie, starting at 1:11 he talks about his monitors. He says, "Probably what you notice first is this dual monitor setup, this is Ultra Wide Screen, and it's *amazing* to play video games on. Like, the extra peripheral vision that you get from it is so cool." Around 1:26 you can see the bezel with "Asus" written on it, and based on the look of the monitors they match the ASUS MX299Q model exactly. He is using two of these stacked one on top of the other.