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Loidp
Beginner
102 Views

NUC8i3BEH USB-C: Display port + USB host

Hi,
I have a NUC8i3BEH and I'm planning to get a USB-C display, probably a Dell. It has been suggested to me that I wouldn't be able to use USB-C for display port and the downstream USB-A ports (to hook up peripherals to the monitor) at the same time.

Is this true? That would render the USB-C port on the NUC much less useful.

Oh, and while I'm at it -- can I power the NUC with PD from the display via USB-C?
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3 Replies
n_scott_pearson
Super User Retired Employee
87 Views

No, this is not true. If you,

  1. Connect a non-Thunderbolt hub/dock device to the USB-C port and have a monitor connected to this hub/dock,
  2. Connect a monitor directly to the USB-C port via a USB-C-to-USB-C cable,

then, if USB is actively being used downstream (from the hub/dock or within/from the monitor), half of the USB-C transmission streams will be unavailable to the monitor because of this USB support. This will result in the capabilities of the monitor being restricted. Now, this is really only an issue if a 4K monitor is being used. In this case, it will be limited to 4K@30Hz. If you are connecting a 2K or lesser resolution monitor, it will operate just fine at 60Hz (and perhaps even higher frequencies).

Regarding the second question, no NUC models support USB-C-based Power Delivery.

...S

Loidp
Beginner
75 Views

Thanks so much, that's good to hear.

So this would actually be a good reason not to go for a 4K display then. Do you think WQHD (2560x1440) would work at 60Hz when using USB-C with the hub at the same time? Is there a way to tell for sure (other than just trying)?

n_scott_pearson
Super User Retired Employee
69 Views

DisplayPort 1.2 has a maximum data rate of 17.28 Gb/s. Half of that is 8.64 Gb/s.

According to the chart (here: https://en.wikipedia.org/wiki/DisplayPort), 1440p@60Hz only requires 5.63Gb/s. Yup, looks like that will work just fine. In fact, 1440p@85Hz only requires 8.07Gb/s, so there is a possibility of that working as well (though that may be pushing our luck).

...S

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