Windows – Extending laptop across 3 monitors

It's very unlikely this will work unfortunately. It's a limitation of many graphics cards. Connecting the secondary external output will either not work, disable the primary output or clone both outputs. I'd definitely suggest testing it with another monitor if someone else you know has one available.

Alternatively, you can purchase external usb video cards that would allow for this. I've achieved this using a Toshiba Dynadock before however I have no doubt there are cheaper options. Good luck!

First, connect the third monitor to a DVI port of the Nvidia GTX 690. I used those 2 DVI ports, but from what I read any port should be fine:

Then, should should go to the Nvidia settings (Control panel > Nvidia). At first they won't be many options:

That's because you're using the DisplayLink driver. You should disconnect the monitor using the DisplayLink adapter, and if needed stop the DisplayLink service. Once done, the Nvidia settings will have more options:

You should disable the multi-GPU mode:

Then select the two monitors connected to the GTX 690's DVI ports:

Then restart the DisplayLink service and re-connect the monitor to the DisplayLink adapter. The "Unable to save display settings" error message should not appear anymore.

Note that you might be able to keep the multi-GPU on and simply connect to other ports: