4k 60fps

I'm using a Samsung UR59C monitor with a Dell dock and Dell XPS 13. Products are linked below (I've confirmed they all support 4k @ 60hz). When using a USB-C to DisplayPort cable directly between the laptop and monitor (my laptop only supports USB-c) I get 4k @ 60hz with no issues. However...

I'm saving up to upgrade my PC and am trying to find the best/correct Mobo for a RX 6800 XT and a Ryzen 7 5800x in an ATX Full Tower Thor V2. The current mobo I am looking at is pricey, but I assume if I save enough it will be worth it in the long run. It's the "ASUS ROG Strix X570-E Gaming...