Can I extend to 2 displays through one Thunderbolt port?

[benshive]

If I use a USB-C dock that has an HDMI and a DP port, can I extend to two external monitors through one thunderbolt 3 port? I'm using a 2017 15" pro. From what I've found it doesn't seem like you can which is surprising considering the impressive 40 gbps bandwidth of the port.

 

[Ryan0751]

It really depends on the dock and your cables.

I have two LG 32" 4K thunderbolt monitors, and I have them daisy chained together using a single thunderbolt cable. In my case I'm connected to an eGPU, which also has a third HDMI output going to a TV. The eGPU drives all 3 displays at 4K 60Hz just fine with a single Thunderbolt cable plugged into my late-2018 Mac Mini.

Also keep in mind not all USB-C and devices are actually Thunderbolt! I made this mistake and initially connected my monitors with a non-thunderbolt cable. It worked for one display, but it was really just running the DisplayPort mode over the USB-C cable. Once I switched it to an actual thunderbolt cable, it was able to drive both displays just fine.

Is your dock a USB-C dock, or a Thunderbolt dock? There is a difference!

 

[Stephen.R]

If I use a USB-C dock that has an HDMI and a DP port, can I extend to two external monitors through one thunderbolt 3 port? I'm using a 2017 15" pro. From what I've found it doesn't seem like you can which is surprising considering the impressive 40 gbps bandwidth of the port.

If it’s a USB-c dock the bandwidth of the port is not the issue.

You need a thunderbolt3 dock.