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Level 1

18 points

Macbook Air M1: No 4K@60Hz possible on my 32" 4K BenQ EW3280U

Last week I received the MacBook Air 13" 2020 with the M1 chip. To my surprise, it fails to output 4K@60Hz via UBC-C on the BenQ EW3280U, resolving only 4K@30Hz.

I also bought a USB-C Thunderbolt cable (USB C to DisplayPort Cable 8K@60Hz Maxonar 4K@60Hz/144Hz/120Hz 5K@60Hz 2K@240Hz Thunderbolt 3 to DisplayPort Cable HBR3 DP 1.4

) which also outputs 4K@30Hz maximum.

Both of deze cables work on this monitor 4K@60Hz with 2 other tested devices.

What is the problem on this?

Posted on Dec 13, 2020 9:22 AM

Best reply

TheAlikA

Level 1

12 points

Posted on Mar 16, 2021 7:36 PM

I think a lot of people are struggling because they are using USB 3.0 (aka 3.1 Gen1, aka 3.2 Gen1x1) that is the most common hub under $50 when in reality there is simply not enough bandwidth to push a 4K display at 60Hz using the 5Gbps of the USB3.0 / 3.1...

for 60HZ you need either:

a dedicated cable (preferably Display Port instead of HDMI)

or a USB 3.1 Gen2 or Higher, Ideally Thunderbolt3 Hub which has a DisplayPort1.4 connection.

For most this should solve the problem, however, some displays might have different problems or like my display (Samsung U28E590D) has only the HDMI1 capable of 4K while HDMI2 is limited to 1080p only.

The USB naming is confusing, so I attach a screenshot:

You need at least 10Gbps to run a 4K at 60FPS screen

p.s. Thunderbolt3 is 40Gbps

View in context

84 replies

jakub133

Level 1

4 points

Jun 8, 2021 11:40 AM in response to AlexB123

Yeah, it does.

Aug 10, 2021 9:03 AM in response to AlexB123

This worked for me! I have two monitors. AsusPB279 which was doing 4k 60hz. and one Asus MG28U doing 4k but stuck on 30hz. Did what you said and it changed my Asus MG28U to 60hz. So weird..

glee217

Level 1

9 points

Aug 31, 2021 1:23 PM in response to Electr0n87

Wow you saved my butt after an hour search. M1 Macbook Air using AOC U2790VQ monitor hookup to HDMI port 1. Also you need the A2119 adapter to have 4k 60hz.