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I have a MacBook Pro Retina mid 2012 and have bought a couple of BenQ 4K EL2870U monitors. I've connected the two monitors up to the MacBook through a couple of Mini Display Port to Display Port cables that support 4K resolution, but I'm unable to get the monitors to display anything above 1280 x 720 resolution.

MacBook Pro (Retina, Mid 2012)

Note that the number of pixels pushed from my MacBook Pro is actually 2560 x 1440 since the chosen resolution is not "low resolution". However, I would rather have 2560 x 1440 "low resolution" than the current 1280 x 720 "high resolution" I currently have, since that gives me less screen real estate than I had on my previous non-4K monitors. If I choose any other resolution ("low resolution" or not), the BenQ just goes blank.

Display Settings

I should at least get it to display all low-resolution modes up to 2560 x 1440, isn't that right? In this related question it seems like even the 3840 x 2160 resolution should be available at 30Hz, but alas it doesn't work for me. Ideas?

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    Generally, it is a good practise to obfuscate the serial number of your Mac/iOS device when sharing the device details publicly. – Nimesh Neema Dec 12 '18 at 9:19
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    What related question? The link you provided is the same as the first image. – Allan Dec 12 '18 at 10:08
  • @NimeshNeema, thanks for the tip, it's now blurred, but I doubt I'll ever get rid of the previously uploaded image from Imgur. :-/ – Asbjørn Ulsberg Dec 12 '18 at 14:09
  • @Allan, sorry, I've now fixed the link. Thanks for pointing it out. – Asbjørn Ulsberg Dec 12 '18 at 14:09
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    From the Apple article on that Mac"...and up to 2560 by 1600 pixels on up to two external displays, at millions of colors." support.apple.com/kb/SP653?locale=en_US, so it should work. I have heard that sometimes lower quality cables can be problematic. Is it possible to try another cable brand or model? – Steve Chambers Dec 12 '18 at 15:25
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By installing SwitchResX I was able to choose 2560 x 1440 (60 Hz) which now gives me the screen real estate I need.

SwitchResX 2560 x 1440, 60 Hz

A really neat choice that doesn't give me as much screen real estate, but makes the screen into a retina 1080p monitor is the 1080p30 option. Everything now looks super crisp and I have the same screen real estate as on a full HD monitor.

SwitchResX 1080p30

A bit annoying that I need a $16,- third party application to fix this problem, but it's better than no solution at all.

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