MSI GS43VR Thunderboldt 3 external display connected to which GPU

Hey guys, if I connect an external monitor to the thunderbolt 3 port, which GPU renders its signal?

I'm asking because I want to use the 1060 for cuda calculations and connect an external monitor. It seems, that the displayport and HDMI port on the laptop are connected directly to the dGPU, so if I connect a monitor there I can't use the full potential of the dGPU.

Has somebody an idea?

 

A small update:
I bought the HP Elite Thunderbolt 3 65W Dock, everything works with the dock (simple plug and play), except the power bottom on the dock and charging/power over thunderbolt 3.
I can connect two monitors to the dock over its two display ports, the intel GPU renders both monitors, I can even disable the Nvidia GPU in the device manager (+ a restart).
It seems this comes close or is the solution for the problem above.

 

So you confirm display port are connected to dgpu? This is good because I want to buy 14 inch laptop and connect g-sync monitor and have g-sync ;-) you confirm?

 

Thunderbolt itself does not use any GPU except your processor. This is identical to the use of USB to VGA/DVI adapter. The CPU usage will be higher if resolution/quality settings are higher.

 

The display port of the laptop MSI GS43VR 7RE is directly connected to the nvidia GPU (dGPU), same goes with the hdmi port. The intel GPU (iGPU) does nothing on these ports of the laptop (because of that I bought the thunderbolt 3 dock (see op)). The screen of the laptop uses nvidia optimus, therefore it can use the intel GPU + streams from the nvidia GPU if requestet by optimus. Same goes with the thunderbolt 3 port, so a monitor connected to a thunderbolt 3 dock can also use the nvidia optimus. This is what I found out/think.

If there are more questions, I'm happy to help out!