[https://www.reddit.com/r/mac/comments/t6p0s4/2019\_macbook\_pro\_4k\_60hz\_over\_usbc\_alternate\_mode/](https://www.reddit.com/r/mac/comments/t6p0s4/2019_macbook_pro_4k_60hz_over_usbc_alternate_mode/)  


I think I've found the solution. Or rather a confirmation that the setup won't ever work in 60hz.

Hi,

I have an external display with my Mac that won't go beyond 30hz. 

Setup is as following:

MBP 13" 2020 i5 with 4 TB 3 ports

Display is Dell UltraSharp 27 U2723QE

..and between them is Apple's own Thunderbolt 3 cable (MQ4H2ZM/A). With that setup I only get 30hz. If I connect the display via a USB-C Dongle that has an DP port, the full 4k resolution works with 60hz. Why would that be? Both the display and the Mac should support 60hz with that cable?

External monitor stuck at 30hz