I tried to use hdmi cable connecting my MacBook Pro 2015 to dell u2718q, I found that there is only 30hz, cannot select 60hz. What’s wrong with it? Can someone teach me how to fix it? Any accessory need to prepare?
MacBook Pro 15″, macOS 11.6
Your 4K display can connect:
1 x DP (ver. 1.2), 1 x mDP (ver. 1.2), 1 x HDMI (ver. 2.0)
so the DISPLAY could connect over HDMI and show 60 Hz.
However, that computer features only HDMI v1.4, according to the article below, which goes up to 30Hz maximum.
Connect to HDMI from your Mac - Apple Support
To achieve 60 Hz refresh rate, Connect ThunderBolt to DisplayPort or Mini DisplayPort. Mini DisplayPort cable is the same at each end, plugs into ThunderBolt-2 port with no conversion.
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Your 4K display can connect:
1 x DP (ver. 1.2), 1 x mDP (ver. 1.2), 1 x HDMI (ver. 2.0)
so the DISPLAY could connect over HDMI and show 60 Hz.
However, that computer features only HDMI v1.4, according to the article below, which goes up to 30Hz maximum.
Connect to HDMI from your Mac - Apple Support
To achieve 60 Hz refresh rate, Connect ThunderBolt to DisplayPort or Mini DisplayPort. Mini DisplayPort cable is the same at each end, plugs into ThunderBolt-2 port with no conversion.
.
If you use a Mini DisplayPort to HDMI cable, it contains an adapter/converter.
Exactly what version of HDMI is supported is the essence of your issue. Unless it supports conversion to HDMI 2.0, you get no 60Hz at 4K resolution.
Hi frankylchan0904, We appreciate you reaching out to us. We understand that you connected your MacBook Pro to a Dell monitor, but you can only get a 30hz refresh rate.
We’d like to gather additional details that may help us be in a better position to assist you.
Have you had the chance to try a different cable?
Have you had the chance to try a different monitor? If yes, are you experiencing a similar issue?
We recommend that you check if the issue persists while on safe mode. Below is an article to help guide you through the process.
How to use safe mode on your Mac
Also, we recommend that you check if the issue persists when signed in on a different user account. The article below can help if you do not have any other user account to test with.
Set up users, guests, and groups on Mac
Take care!
I went to Apple retail shop and staff said no accessory can provide for the solution u suggested.
and they said due to the Han ware restriction, it can only go up to 30hz. I was like WTH…. Spent hkd18000 for a laptop cannot output 60hz?
I did try other cable but same result.
didnt try other monitor and safe mode
Thanks dude. I will get a cable next few days for the testing.
one more question, is it okay to use a mDP to hdmi cable or must use mDP to DP/mDP cable ?
Apple has never sold a Mini DisplayPort cable, because they have "nothing special to add, so it was left for aftermarket vendors".
That does not mean a Mini DisplayPort cable is not readily available.
To achieve 60 Hz refresh rate, Connect ThunderBolt to DisplayPort or Mini DisplayPort. Mini DisplayPort cable is the same at each end, plugs into ThunderBolt-2 port with no conversion.
here is one:
Monoprice Select Series Mini DisplayPort 1.2 Cable, 6ft - Product # 13365 -$8.49
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u2718q for macbook pro 2015
