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Refresh Rate and Graphics Support
A graphics card capable of driving a 4K display is needed to enjoy the full resolution.
It is possible to use the LG 31MU97 on an older computer: the display will scale the signal according to various settable built-in menu options: scaling-to-fit or fitting within or aspect ratio preservation, along with sharpening options to make lower-resolution signals look more crisp. Scaled resolutions are not recommended for serious use.
A 4K display really mandates a computer capable of driving it properly.
At a scaled resolution of 2048 X 1080 is really full 4096 X 2160 as far as what is actually going on under the covers. At this full resolution, the maximum refresh rate is 50 Hz, a limitation imposed by the available bandwidth in the HDMK 1.2 standard.
Apple Mac support
Using 4K displays and Ultra HD TVs with Mac computers at Apple lists the LG 31MU97 as supported, but only at 30 Hz and 50 Hz.
You can use 4K displays and Ultra HD TVs with these Mac computers.
- MacBook Pro (Retina, Late 2013 and later)
- Mac Pro (Late 2013)
- iMac (27-inch, Late 2013 and later)
- Mac mini (Late 2014)
You can use 4K displays and Ultra HD TVs at the following resolutions and refresh rates via the built-in HDMI port.
3840 x 2160 at 30 Hz refresh rate
4096 x 2160 at 24 Hz refresh rate (mirroring is not supported at this resolution)
With OS X Mavericks v10.9.3 or later, the following DisplayPort displays are supported at their default using single-stream transport (SST) at 30Hz.
With OS X Yosemite, you can use all of the above displays as well as the following:
- LG 31MU97 4K display (at 30Hz or 50Hz)