Unable to get 4K @ 60 Hz | Macbook Pro 2017

[rafayshaukat]

Hello,

I have been unable to achieve 4K resolution @ 60 Hz. I'm unable to get 60 Hertz refresh rate. The option is greyed out at 30 Hertz. I have the following hardware:

• Macbook Pro 2017 (with 4 Thunderbolt 3 ports)
• USB-C to DisplayPort Cable
• LG Ultra HD 4K IPS Monitor (27UD68-P)

I have been searching the internet for hours looking for answers and I can't seem to figure out what's wrong. I even read a few Amazon reviews on the cable I'm using and people seem to have 4K @ 60Hz on this same monitor.

Under System Preferences > Display, this is what I get:

What's the problem here? Is it the monitor or the cable I'm using?

 

[jrichards1408]

That resolution in the pic is 4k...

 

[rafayshaukat]

That resolution in the pic is 4k...

Yeah, but I'm talking about the refresh rate. It's greyed out at 30 Hertz which is extremely choppy and quite frankly unusable. I'm trying to get a 60 Hz refresh rate @ 4K resolution.

 

[IngerMan]

Yeah, but I'm talking about the refresh rate. It's greyed out at 30 Hertz which is extremely choppy and quite frankly unusable. I'm trying to get a 60 Hz refresh rate @ 4K resolution.

Did you try all your ports on mbp?

 

[rafayshaukat]

Did you try all your ports on mbp?

Just did. Same results.

 

[IngerMan]

I read the 10% 1 star reviews of your cable. I would not use that cable in my case, sounds risky


It also has some bad reviews but not frying the machine like the Amazon one.

https://www.apple.com/shop/product/HLR62ZM/A/moshi-usb-c-to-displayport-cable?fnode=8b&fs=f=13_mbp_thdblt3_late2016&fh=4595%2B4803

 

[Premal212]

I had this problem some time ago, it was due to the adaptor being HDMI 1.4 which only supports 4k@30hz. Purchased another adaptor that does HDMI 2.0 which is 4k@60hz. Of course, yours is a different case with display port.

o I'm not overly sure, potentially the dudes who sent you the cable may be selling you garbage? My only thoughts

 

[rafayshaukat]

I had this problem some time ago, it was due to the adaptor being HDMI 1.4 which only supports 4k@30hz. Purchased another adaptor that does HDMI 2.0 which is 4k@60hz. Of course, yours is a different case with display port.

o I'm not overly sure, potentially the dudes who sent you the cable may be selling you garbage? My only thoughts

That's what I'm leaning towards as well. I just don't understand what exactly am I doing wrong.

 

[Fishrrman]

Some (not all) USB-c to displayport cables that work with 2016 MBPs WILL NOT WORK with the 2017/18 MBPs.

The only way to know is to read the user reviews (and also product ad should specifically state that it's good with the 2017/18 MBPs).

 

[Premal212]

Yeah just try another adaptor with some better reviews on Amazon. Let us know how you get along

 

[Samuelsan2001]

That's what I'm leaning towards as well. I just don't understand what exactly am I doing wrong.

Sometimes you have to change the settings on the monitor!! Have you done this??