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Please, does anyone know whether Macbook (2015) with MacOS Sierra (10.12) is able to drive Dell P2415Q 4K (3840x2160) monitor at 60Hz? What dongles do I need?

I have USB-C Digital AV Multiport Adapter which is said to support "UHD (3840 by 2160) at 30Hz". But Apple's Using 4K displays, 5K displays, and Ultra HD TVs with your Mac states:

With macOS 10.12 or later, MacBook (2015 and later) and MacBook Pro (2016 and later) support these resolutions and refresh rates over HDMI 1.4b using the USB-C Digital AV Multiport Adapter:

  • 4096x2304 at 48Hz refresh rate
  • 3840x2160 at 60Hz refresh rate (mirroring is not supported at this resolution)

MacBook (2016 and later) and MacBook Pro (2016 and later) support 60Hz refresh rates over HDMI when used with a supported HDMI 2.0 display, an HDMI Premium Certified cable, and a supported USB-C to HDMI 2.0 adapter.

So I'm confused now: would it work somehow? Would it work over HDMI? Would it work over DisplayPort? Is the adapter I have suitable?

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  • Wouldn't something like this work?
    – NoahL
    Commented Jun 13, 2017 at 20:44
  • @NoahL That would be an option, perhaps, but unfortunately the Macbook only has one USB C port so I'm not sure how would I charge it, hence that Multiport Adapter..?
    – Rhem
    Commented Jun 13, 2017 at 21:09
  • Have you contacted Dell and asked them? There's several dozen "will this adapter work with my Mac?" questions on the site, have you searched for similar questions/answers?
    – fsb
    Commented Jun 13, 2017 at 21:15

2 Answers 2

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Answer is yes with the right USB C to DP adapter. I have a 2015 MacBook and I have tried it with two very different 4K displays - one Philips, one LG - and both worked correctly at 4K 60Hz. If fact, they work in Bootcamp, too at 4K 60hz. Impressive.

FYI, I understand this capability arrived with the Sierra MacOS update. Earlier MacOS versions limit you to 30Hz on this MacBook.

I use a Club3D branded adapter.

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  • How do you charge the Macbook if the USB-C port is used for DP adapter? Do the monitors supply the power or does the adapter have additional USB-C ports?
    – Rhem
    Commented Jun 15, 2017 at 7:03
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Per Apple's MacBook Specifications page:

Intel HD Graphics 5300

Dual display and video mirroring: Simultaneously supports full native resolution on the built-in display and up to 3840 by 2160 pixels on an external display, both at millions of colors

What's important to understand here is that this is not a Thunderbolt port - this is USB-C only.

enter image description here

So, to make this work, you need an Active USB-C to DisplayPort Adapter or an Active USB-C to HDMI Adapter

Please reference this post where I detail the difference between Active vs. Passive Adapters

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  • Allan, OP is specifying the 2015 MacBook, not the 2015 MacBook Pro, and specifies the USB-C adapter they have, so I am pretty sure OP is NOT referring to the same laptop you are.
    – NoahL
    Commented Jun 13, 2017 at 21:04
  • @NoahL - you're right...I don't know why I saw "pro" in his question.
    – Allan
    Commented Jun 13, 2017 at 21:06
  • Thanks, but the cited page is for the current line of Macbooks, whereas 2015 model has Intel HD 5300.
    – Rhem
    Commented Jun 13, 2017 at 21:32
  • @Rhem - true...I fixed it, though the solution is still exactly the same.
    – Allan
    Commented Jun 18, 2017 at 22:43

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