Question SAMSUNG U28E590D 60hz via adapter

Skraw

Prominent
Mar 16, 2019
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So I’m using this monitor on my MacBook Pro using a USB C HDMI adapter that is 60hz capable at 4K. No matter what I do I cannot get the monitor to display 4K at 60hz.

I can use this same exact setup on a different HP 1080p monitor and get 60hz.

And then I can hook up this Samsung monitor to my PC via a video card connection and get 60hz over hdmi at 4K.

So I’m using the same cables and adapters in all scenarios, I get 60hz on every other scenario accept this one. This monitor on my laptop will not do 60hz at 4K. I’m going nuts. Any ideas?
 
The MacBook (2015 and later), MacBook Pro (2016 and later), iMac (2017 and later), and iMac Pro (2017) support these resolutions and refresh rates over HDMI 1.4b when using the USB-C Digital AV Multiport Adapter with macOS Sierra 10.12 or later:

  • Up to 1080p at 60Hz
  • 3840 x 2160 at 30Hz
    These computers also support 60Hz refresh rate over HDMI when used with a supported HDMI 2.0 display, HDMI Premium Certified cable, and a compatible third-party USB-C to HDMI 2.0 adapter.
Using 4K displays, 5K displays, and Ultra HD TVs with your Mac - Apple Support
 

Skraw

Prominent
Mar 16, 2019
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So this is a 2016 MacBook Pro. So you’re saying that the MacBook WILL do 4K 60hz over a usbc adapter as long as the display, adapter and cable is supported?
 
So this is the adapter. I really just need the hdmi, Ethernet and Usb connections. Is this the culprit?

USB C Docking Station, Dual HDMI Adapter 12 in 1 Triple Display USB C Hub with VGA, Gigabit Ethernet, 100W PD, 4 USB Ports, SD/TF Card Reader Audio for MacBook Pro and Type-C Laptops https://www.amazon.com/dp/B08BFHRWBH/ref=cm_sw_r_cp_api_glc_fabc_aH57FbEP3K2WP?_encoding=UTF8&psc=1
"Single use HDMI 1 can up to 4K 60Hz under DP1.4 source"
yup thats the culprit, as your MacBook is DP1.2
 
your macbook has just 1 usb-c port?
it should handle 40Gbit under TB3 and 10Gbit under usb-c
thats 50Gbit (no idea if shared)
but at 4k @ 60Hz it wont go over 20Gbit there (2.0 cable is 18Gbit)
tho 4 DP1.2 links will eat ~25Gbit
so u still have some space for 1Gbit ethernet and usb 3

so a tb3 to hdmi (4xDP1.2) and some random usb-c 3.1 hub (10Gbit) with ports/ethernet should work together (using 2 ports from your macbook)
 

Skraw

Prominent
Mar 16, 2019
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510
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Ok I unplugged everything from the adapter EXCEPT the hdmi cable. I still can’t get the 4K monitor to do 60hz. I tried all 4 USB C ports on the MacBook as well. But if I plug the same hdmi cable into my other 24” 1080p monitor I get 60hz.
 

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