I need some help understanding how the thunderbolt 3 port on my mobo works.

[Grim-Grape]

I was trying to manage cable clutter, so I'm in the process of shifting as many things as possible over to the thunderbolt 3 ports. I decided to try and power (by power I mean driving the display, not power as in supply electricity)  one of my monitors with the thunderbolt 3 port and leave the other monitor plugged into my graphics card. Now, I can't get both the monitors to remain on at the same time . Is the thunderbolt port using an internal graphics chip set to drive my monitor? If so, is there a way to allow me to use the internal chip set and my graphics card to drive my monitors at the same time ? 
 

EDIT: I have tried using passive and active thunderbolt 3 cables.

 

Thank you in advance.

Grim

[suits]

Yeah, as far as I know you can't run monitors off your GPU and one of the internal graphics (what your thunderbolt 3 is running off of).

[EunSoo]

what motherboard do you have? I didn't know there were mobos with Thunderbolt 3 yet. If the Thunderbolt 3 connector is on your motherboard then it is using your onbourd graphics

[Grim-Grape]

13 minutes ago, SCGazelle said:

what motherboard do you have? I didn't know there were mobos with Thunderbolt 3 yet. If the Thunderbolt 3 connector is on your motherboard then it is using your onbourd graphics

 

This girl over here:

http://www.gigabyte.com/Motherboard/GA-Z170X-UD5-TH-rev-10#ov

[kirashi]

38 minutes ago, suits said:

Yeah, as far as I know you can't run monitors off your GPU and one of the internal graphics (what your thunderbolt 3 is running off of).

some motherboards actually do support this, however, most programs are mentally retarded and either won't be able to detect your GPU anymore, or will claim you have NO GRAPHICS DRIVERS INSTALLED WHATSOEVER. (Obviously impossible, otherwise how would we be able to read such an error message? ) Looking at you, Adobe CS/CC apps. So... you're still spot on that @Grim-Grape should only really be using the graphics card outputs on the card itself.

[EunSoo]

25 minutes ago, Grim-Grape said:

 

This girl over here:

http://www.gigabyte.com/Motherboard/GA-Z170X-UD5-TH-rev-10#ov

Very very nice