Run two 4K and one non-4K external display from late 2013 Macbook Pro

I have a late 2013 Macbook Pro with both the Intel Iris Pro integrated graphics and the NVidia Geforce 750M dedicated GPU. I run two 4k displays, one at 60Hz through a thunderbolt bolt and one at 30Hz through HDMI. I have one open thunderbolt port, and would like to add a 3rd external display. I know that it is possible to run three external displays from this model (see here, here), but I also know that it is not possible to run three 4k displays (see here).

My question:

Is it possible to run three external displays, one at 4k/60hz, one at 4k/30Hz, and one at some other resolution/refresh-rate? If so, what is the max resolution/refresh supported for the third monitor?

You are outside "supported" territory with using three screens on that hardware.

• https://support.apple.com/en-us/HT204154 - thunderbolt FAQ
• https://support.apple.com/en-us/HT206587 4k and 5k and beyond

That being said, you can try connecting things and Apple hardware is known to run more displays than the "support" document allows. Usually it's due to driver updates that can still juggle all the connections but that the performance isn't there or you end up with glitches like frozen screens or just not the frame rates Apple likes to see on supported hardware combination.