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<< Solved >> 4k Display showing as 5k in System Information (not in displays pref pane)

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Motherboard
Gigabyte GA-Z87-D3HP
CPU
i5-4670
Graphics
RX 560
Mac
  1. MacBook Air
Classic Mac
  1. Performa
Mobile Phone
  1. iOS
I just bought a 4k LG display, in System Preferences and in 'About this Mac' the display shows a max resolution of 3840 x 2160 as expected.

In System Information it shows 5120x2880. I ignored this initially as everything was working fine. However just noticed that in VMWare the native res is showing as 5120x2880 too.

Display: LG 27UK600
Graphics Card: AMD Radeon RX560

Anyone else run into this, or have the same display and aren't seeing this issue?

Screenshot 2019-01-30 at 14.42.23.png

Screenshot 2019-01-30 at 14.42.30.png
 
I got almost the same thing as you, I got a sceptre 4K monitor and shows in info like 5k or 8k ( 6720 x 3780) and the most extrange is that it works in this ultra hi resolution.
I wonder why is possible, im using UHD 630 (core i3 8100) and it showing above res , but when I use my XFX RX580 is like 5 or 6K too.
 
I have the same issue with an AOC U3277WB 4k display connected to a RX 580.
 
I think I know what it may be. I’m using display scaling. Found this on ****** about how apples scaling works:

What you can do is set it to a scaled "like 2560x1440" resolution. What that does is render a 5K (5120x2880) desktop using those high-DPI controls and assets (so everything is effectively the same size as a 2560x1440 display), then downscales it to 4K and outputs it your monitor. This means things are not quite as high res as an actual 5K display and not quite as crisp as running at "native" 4K, but it'll still be better than a normal 2560x1440 display (because it's actually a 5120x2880 image downscaled to 3840x2160).”

So as I’m running 2560*1440, internally it’s rendering 5k and halving it. That’s my theory based on the above quote anyway!
 
ill try it.
 
3360x1890 appears to be one of the scaling options, so i think this is solved
before was like I said above, but now I do not know why is appearing like using RX580 ( but in That case is using UHD630).
 

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when you hover over one of the options it shows the 'looks like' resolution.

I tried various options and confirmed it will always show the resolution as 2x what you chose - so everything is working fine/as expected
 
@revevs wrong, definitely not always. if you choose 4k, it will show 4k. otherwise it renders at a 4x resolution, not 2x. just read about how macOS scales. That is why it is shown to thread starter 5k and that is why many programs like intellij products are very slow at scaled resolutions and ok at native res.
 
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