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What are the requirements of doing 2k@60hz for 2 monitors over a single usb c hub (usb to hdmi)

What are the requirements of doing 2k@60hz for 2 monitors over a single usb c hub converted to hdmi? What stats do I need to be looking for?

I have a usb hub with 2 hdmi ports. It is advertised to do 4k@60hz for 1 monitor or 4k@30hz for 2 monitors. I have attached 2 monitors and am attempting to do 2560x1440@60z, but it maxes out at 1920x1080.

I'm not trying to get help troubleshooting this particular hub, but generally, what specs should I be looking for in a usb c hub/adapter in order to achieve this?

Simple math would show

2x4k@30hz is 3840*2160*30*2 = 497664000 2x2k@60hz is 2560*1440*60*2 = 442368000442368000 <= 497664000

but clearly I'm not understanding something since it isn't displaying at that resolution.


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