Laptop-how many 4k monitors will this run?

wfcrr
wfcrr used Ask the Experts™
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I am thinking about ordering a few of these.  These Descriptions are from the Dell Quote, can you tell how many 4K monitors the laptop will be able to run?

Mobile Precision 7730 XCTO BASE

Nvidia Quadro P3200 w/6GB GDDR5

Dell Precision Dual USB-C Thunderbolt Dock - TB18DC

Ideally each laptop with the dock would run at least 2 different external 4k monitors.
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
From PC Mag Review, Quote
"The chassis is outfitted with two USB Type-C ports that support Thunderbolt 3, as well as three USB 3.1 Type-A ports, an SD card reader, HDMI and mini DisplayPort outputs, an Ethernet jack, and a headphone jack. Our unit also includes fingerprint and SmartCard readers for secure sign-ins. Between these, you have options for nearly every peripheral and display-output scenario, especially given the daisy-chaining capability of Thunderbolt 3."

You should be able to run 2 different displays but I have not been able to find that it could support more than 2

Author

Commented:
Thanks for the quick response. Can you tell if the 2 external displays can run in 4k resolution 3840x2160 on both?
Business Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018
Commented:
The specs I read are all gaming specs (no interest to me) but I think the external displays support the same 4K as the main display.

You would want to get this in writing from Dell before purchasing.
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JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
Thank you and good luck with extra monitors for your machine.
Top Expert 2014

Commented:
It may support 4 monitors since you can daisy-chain them on displayport 1.2 or above.
Andrew CeohanSys & Net Admin
Commented:
Wanted to add more info to this since no hard facts were posted above.  The TB18DC will be using the internal dGPU for monitors connected to it over USB.  This is not always the case with USB-C docking stations such as the D6000, some USB C docking stations do not use the internal dGPU.

TB18DC has 4 video ports but you can ONLY use the full size displayport connection for 4K 60hz.  You can run three 4K monitors using the two displayport ports and HDMI but because of bandwidth, all three monitors will only run at 30hz.  That dock can only support three monitors at a time.  Also, since the laptop does have a mini-displayport and that GPU supports DP 1.4 (Multi-Stream Transport compatible ) using a Pascal (GP104) chipset, you should be able to chain 4 together directly off the laptop.

Author

Commented:
@Andrew, do you know if I really need the doc if all I plan to do is run 2 external 4k monitors, and, do you know of a laptop that will run 2 or more external monitors at 4k 60hz?
Top Expert 2014
Commented:
I'd like to know more about this daisy-chaining as well, Dell have a whitepaper on making the end screen DP1.1 so it acts as a "terminator" to a DP2.2 or above chain which is why I initially  pointed out that that 4 monitors can be run off the single laptop graphics chip rather than two which would be the limit of DP1.0 but exactly how many?

As far as I understand you could chain 20 * 4K screens off one laptop that has DP1.2 / DP1.4 but you could not update what is seen very often.

"all three monitors will only run at 30hz" is possibly how fast you can change what is displayed on each screen but surely it is not the refresh rate as a digital monitor has its own internal RAM to store the image so does not need refreshing every few nanoseconds to avoid flicker. "refresh rate" as in how fast the screen's pixels are flashed must surely be an internal part of the display rather than bandwidth related?
Top Expert 2014

Commented:
Saw John pop up at bottom of screen as watching while I was typing. John, do you know anything about 4K displays because I don't although I do understand the electronics/maths.
JohnBusiness Consultant (Owner)
Most Valuable Expert 2012
Expert of the Year 2018

Commented:
I read through the specifications.  I have a 4K Television but not a standalone 4K monitor.
Top Expert 2016
Commented:
That card is not recommended for 4K

The 30hz refresh rate is how often the monitor will receive updates the screen will redraw @ 30hz. digital monitors don't have ram memory.. I have yet to see a display panel that contained memory. The pixel just stays at its current state until it is changed by a refresh.

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