To support 4K at 60Hz, you need to properly enable support for DisplayPort 1.2’s Multi-Stream Transport (MST) feature. Contrary to what Apple’s own support documentation lists, these 4K resolutions at limited refresh rates are supported via both HDMI and Thunderbolt 2/DisplayPort 1.2 on the new rMBPs. That’s acceptable for use as a video preview display, but extremely frustrating for anything else (try watching a mouse cursor animate at 30Hz). While the 2013 MacBook Pro with Retina Display can presently support outputting to either an 3840 x 2160 or 4096 x 2160 external panel, the maximum supported refresh rate is only 30Hz under OS X (and only 24Hz in the case of a 4096 x 2160 display).
Alternatively you can connect up to six 2560 x 1440 displays using the Thunderbolt 2 ports at the back of the machine. You can connect two 4K displays via Thunderbolt 2/DisplayPort, and the third 4K display over HDMI. A huge part of the Mac Pro revolves around its support for 4K displays.
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