dual 4K@30fps on USB 5Gbps. How is that possible?

lowieken · 07-31-2020, 06:14 AM

Hello,

I have a rather general question on DisplayLink docks and bandwidth usage.
For example, the HP Universal USB C/A dock. This supports 2 x 4K display (even 3 on TB hosts). However this dock has a USB 3.2 Gen 1 host interface (5 Gbps).
In my calculations I find that one 4K@30fps display takes up around 6 Gbps uncompressed.
So my question is: how is it possible then to have 2 x 4K@30fps over a 5Gbps host interface?
What am I missing?

Cheers

Kris

07-31-2020, 06:14 AM	#1
lowieken Junior Member Join Date: Jul 2020 Posts: 3	dual 4K@30fps on USB 5Gbps. How is that possible? Hello, I have a rather general question on DisplayLink docks and bandwidth usage. For example, the HP Universal USB C/A dock. This supports 2 x 4K display (even 3 on TB hosts). However this dock has a USB 3.2 Gen 1 host interface (5 Gbps). In my calculations I find that one 4K@30fps display takes up around 6 Gbps uncompressed. So my question is: how is it possible then to have 2 x 4K@30fps over a 5Gbps host interface? What am I missing? Cheers Kris