Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yes, but only at 30Hz.

Not true. You have to read further down the page. 60Hz for Single Stream Transport Displays.

With OS X Yosemite v10.10.3, most single-stream 4K (3840x2160) displays are supported at 60Hz operation on the following Mac computers:
MacBook Pro (Retina, 13-inch, Early 2015)
MacBook Pro (Retina, 15-inch, Mid 2014)
Mac Pro (Late 2013)
iMac (27-inch, Late 2013 and later)
Mac mini (Late 2014)
MacBook Air (Early 2015)
MacBook (Retina, 12-inch, Early 2015)
 
Last edited:
yeah i believe higher resolution needs extra adapters, probably a display port adapter. the apple hdmi adapter seems to only support up to 1080p
 
Per 9to5mac

For Apple’s new 12-inch MacBook, the device will support displays running at a resolution of 3840×2160 at 30 Hz or 4096×2160 at 24 Hz over HDMI. Since the device only has a single USB-C port, you’ll need a USB-C Digital AV Multiport Adapter. Technically it’s possible Apple could support monitors hitting the market that use HDMI 2.0 at 60 Hz, but you’ll of course still need the appropriate USB-C adapter.

If you want 60Hz on the new 12-inch MacBook, you’ll need an SST display, DisplayPort cable, and OS X 10.10.3. Although you’ll also need to get an adapter in order to go from the 12-inch MacBook’s 1 USB-C port to DisplayPort on the display— like this one.

Additionally, Apple’s update to its 4k support doc confirms that it’s officially supporting Dell’s new UP2715K 27-inch 5K display following the OS X 10.10.3 update on the Mac Pro (Late 2013) and iMac (Retina 5k and 27-inch, Late 2014).
 
I just saw that... exciting, can run another 5k display next to this one! Just need the price to drop now... :)
 
A USB Type-C to DisplayPort cable like this one.

That won't work while you're charging your MB. And you have to be charging your iPad for it to do video out with the lid closed. And I don't think the MB will do both the internal display and the external 4k display at the same time with any kind of decent performance. So I expect we'll still need a better adapter that does DisplayPort out.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.