2019 Macbook Pro 16-inch does not output 60Hz refresh rate on two external monitors

Hi,


I am trying to connect two HP z27e monitors to my 2019 Macbook Pro 16-inch, with 16GB RAM and AMD Radeon 5440, running MacOS Ventura. My issue is that I am not able to get 60Hz refresh rate at 2560 x 1440 resolution. From my knowledge, the laptop should be able to handle two monitors running at 4K 60Hz. Facing the issue in both clamshell mode and otherwise.


I am connecting using HDMI on monitor to USB-C on Macbook Pro. Not using any connectors. They both are Ultra High Speed HDMI cables, so I know its not a cable limitation.


Any idea how to resolve this?


Thank You

MacBook Pro (2017 – 2020)

Posted on Sep 26, 2023 6:54 AM

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Posted on Sep 26, 2023 8:50 AM

<< I am connecting using HDMI on monitor to USB-C on Macbook Pro. Not using any connectors. >>


2019 MacBook Pro 16-in does not have ANY HDMI outputs.


¿What cables, adapters or docks are you using to make the conversion from the Computer's USB-C ports to the Displays' HDMI ports? please mention every item.

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Question marked as Top-ranking reply

Sep 26, 2023 8:50 AM in response to sankethrit2013

<< I am connecting using HDMI on monitor to USB-C on Macbook Pro. Not using any connectors. >>


2019 MacBook Pro 16-in does not have ANY HDMI outputs.


¿What cables, adapters or docks are you using to make the conversion from the Computer's USB-C ports to the Displays' HDMI ports? please mention every item.

Sep 28, 2023 10:35 AM in response to sankethrit2013

<< The specs on the cable are fine because it works with other laptops. >>


Yes, you can make the connection, but NOT for 'whatever you want' unless you accept lower signal quality.


The Apple standard for its built-in hardware-accelerated displays, makes them suitable for full-motion video for production/display of cinema-quality video with NO dropped frames, and NO dropouts or partial-blank scan lines due to memory under-runs or other issues.


On more recent Macs, the specs have been tightened considerably, and what was good enough on older devices will not display properly on a modern Mac running the latest versions of MacOS.


Full-motion, Full-color Video is THE highest unrelenting data rate of anything you ask a computer to do for you. The cables that support it properly use multiple tuned dual-rail Driver and Receiver circuits and are generally limited to under a Meter in length.


You are not providing anything even approaching the 32,000 M bits/sec pathway provided by an appropriate DisplayPort, ThunderBolt or USB-C cable (strictly under 1 meter in length) required for full-motion video at high resolutions.


The cable you linked to has a 2 meter USB section with a HDMI converter at the display end. That means the USB section is more than TWICE as long as is acceptable for straight USB connection, and THEN it gets converted again to HDMI.


While CERTIFIED HDMI cables can be slightly longer, they really must be CERTIFIED, and it's the HDMI section that can be extended, NOT the USB section.


the "4k" display you linked to appears to have these inputs:

HDMI

[Mini] DisplayPort

[full-size] DisplayPort


my recommendation is to keep troublesome HDMI far away form your recent Mac computers, and instead try a USB-C to DisplayPort cable. Here is an example:


Monoprice 8K@60Hz, 4K@144Hz/120Hz, 2K@240Hz USB-C to DP Cable, 6ft Product # 44469 --$14.99


.

Sep 27, 2023 5:03 PM in response to sankethrit2013

Using inadequate cables is THE most common problem, that produces exactly the symptoms you are reporting. So please forgive me if I appear unrelenting in asking:


What brand cable and/or where did you get it and/or how do you know it meets those specs?


Also, I am unable to find specs for that specific display. could you share a link to its specs?

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2019 Macbook Pro 16-inch does not output 60Hz refresh rate on two external monitors

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