so i just moved the USB-C to DP direct to laptop port like you originally suggested and its goes full 165 Hz for that specific connection. For the other 2 still connected to the dock, they allow both 120 Hz… so i guess an educated guess is that its 60Hz x 4 port dock, or it must combine some how depending on the # of monitors you plugin (up to 4). With 1 going to thunderbolt port in dock and 2 x DP from dock i get:
monitor 1: 144p @ 120 Hz
monitor 2: 144p @ 120Hz
monitor 3: 144p @ 165Hz ← bypass dock and plug to laptop direct
but i just set monitor 3 to 120Hz to match, i found 60Hz just fine for desktop work as well.
All in all, you are 100% correct if you want to achieve full refresh rates, the dock will limit you, but thinking about this, its a work laptop, i really dont care about high refresh rates on it, only my gaming machine, so this setup is more than acceptable.
Here is what i am sticking with as it gives me 120Hz 144p across 3 monitors on my work laptop and full 144p @ 165Hz across 3 monitors on gaming rig… phew ! thank you Wendell
