When used without any scaling by the OS, at UHD resolution, things became too small for normal use. I really like how sharp the text looks when using 1920 x 1080 50Hz with HiDPI. From the “Current Resolutions”, you can now select 3840 x 2160 50Hz. If you have a small 28″ monitor, I recommend using 1920 x 1080 50Hz HiDPI, which still gives full advantage of the UHD resolution. After saving, reboot the machine, and you should see that this custom profile is Active now. Quit switchResX and it’ll ask to save the settings. Note that this number shouldn’t go over 450 MHz which is the limit of the intel Iris 5100 graphics. The rest should be configured automatically, and you’ll see the Pixel clock rate of 433.36 MHz. Horizontal Active, and Vertical Active, and Vertical Scan rate. There are three boxes where you can fill the values in.

In switchResX, select the monitor on the left, and on the right side you’ll see “Custom Resolutions”.Īdd a new profile by clicking the “+” sign on the bottom.Ĭheck the box for “Use simplified settings” and choose “CVT-RB v2”. I bought this cable from Monoprice for about $8 shipped.

When shopping for the cable, also make sure that it is DisplayPort 1.2 and not 1.1. Using switchResX, you can create a custom profile and make the display work at 50Hz through your miniDisplayPort (which is the Thunderbolt jack). UHD resolution at 30Hz will work without a problem using HDMI or miniDisplay port, but at 30 Hz any moving things on the screen, the mouse pointer, or scrolling becomes very sloppy and choppy looking. This is my experience with Acer CB280HK 4K 28″ ULTRA HD monitor I bought through Costco for $410. But before going ahead and buying one of these, you should make sure that your hardware can handle these. UHD resolution (also known as 4K) monitors are becoming more and more affordable these days.

Switchresx 4k mac pro 2015