MacBook Pro M2 Pro can not connect to two Samsung G9 monitors

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Level 1

4 points

MacBook Pro M2 Pro can not connect to two Samsung G9 monitors

I’ve got a Macbook pro with M2 Pro chip. It says it can connect to 2 external monitors at 6k 60hz. I tried to connect to two Samsung G93SC monitors (5120x1440, somehow less pixels than 4k) with many combinations of displayports/hdmi cables. But could only get one display working at a time:

Reduced refresh rate to 60hz on both
Put both on thunderbolt 4 displayport or one on hdmi. But only one will show up (either one works, but not together)
Tried clamshell mode with lid closed

I saw posts of others struggling with this configuration, and reliably don’t see the reason why this is not supported in MacOS, I am guessing it’s just a missing display mode to be added in by devs, is there a way to report this?

MacBook Pro 16″, macOS 14.6

Posted on Nov 30, 2024 7:17 AM

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Answer 1

WheelieNick

Level 8

46,309 points

Nov 30, 2024 7:36 AM in response to taiwanwombat

if you have the M2 MacBook Pro it should be compatible with 2 external monitors:

MacBook Pro models introduced in 2023 or later with the M2 Pro or M3 Pro chip support up to two external displays simultaneously, based on the resolution (up to 8K) and refresh rate (up to 240Hz) of each external display.

One external display

Supports one display in any one of these configurations:

One display up to 6K at 60Hz over Thunderbolt
One display up to 8K at 60Hz (or 4K at 240Hz) over HDMI

Two external displays

Supports two displays in any one of these configurations:

Two displays up to 6K at 60Hz over Thunderbolt
One display up to 6K at 60Hz over Thunderbolt, and one display up to 4K at 144Hz over HDMI

If you cannot get it to work you might want to report it to Apple so that they can look in to this behavior, please do so using this form: Product Feedback - Apple

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Answer 2

taiwanwombat Author

Level 1

4 points

Nov 30, 2024 9:04 AM in response to WheelieNick

I can plug in 2x 4k monitors. Or one 4k and one G9. Just not 2xG9. So trees definitely support 2 monitors, just not two G9s. The G9s has up to 240hz refresh rate but I have limited them to 60, I have brand new thunderbolt to dp1.4 cables that can handle 8k too. And the M2 pro can do 6k x2, so just not sure what’s the deal with these 5k monitors.

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Answer 3

Dec 4, 2024 6:22 AM in response to taiwanwombat

<< I have brand new thunderbolt to dp1.4 cables that can handle 8k too. >>

so you have each of these two 4K displays on its OWN cable?

and these cables, is the USB portion of the cable up to the converter electronics ONE meter or less, AND the DisplayPort section of the cable ONE meter or less?

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MacBook Pro M2 Pro can not connect to two Samsung G9 monitors

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