XPS 15 9550 Thunderbolt 3 Gaming

This is a pretty simple question that I have so far been unable to find a clear answer.

I am replacing my aging desktop with an XPS 15, possible upgrading to a Razer Blade at some point.
I will be using the laptop display along with 2 24" monitors. When gaming I would prefer to use one of the 24" screens instead of the laptop display, but still utilizing the onboard graphics card (960m I believe).
I know this is possible with a direct HDMI connection, but I am wondering if I can also achieve this with the Thunderbolt 3 connection.

Basically I am hoping to come home and plug the laptop up to my home rig using the least amount of cables and still be able to game on the larger monitor. If I could come in and plug in a single Thunderbolt 3 adapter AND be able to game on the larger monitor that would be fantastic.
Right now I am using the D3100 via USB 3.0, the laptop charger, and a HDMI cable and it is a pain.

 

The Thunderbolt 3 port can support any video output (DisplayPort, HDMI, DVI, VGA) with the correct cable/adapter/docking station.

If you're going to be connected to separate monitors most of the time, and you have the extra space for it, I would get an external GPU. The Akitio Node enclosure should work fine. Stick a GTX 1070 in it, and you'll see a noticeable improvement in performance, even with a lower-power i7 6700HQ CPU. It's an extra expense, but in return it should provide some longevity while being able to go with you when you eventually change notebooks.

 

I am considering an external GPU for down the road, but for right now you are saying I should be able to connect my external monitors (both?) via the single TB 3 port and just utilize the on-board GPU?

 

You can connect them both using a Thunderbolt 3 dock. Dell's solution has all the ports you'd need, plus gigabit Ethernet, audio, and extra USB. It can even provide power to charge the machine.

 

We have one of those docks at my office that I can try, but I did not think it would use the GPU. Thought that it would output to the displays similar to the way the D3100 does (using DisplayLink), which does not use the notebook's GPU. I will try that out, because I do still need USB and Ethernet inputs.