Displayport output device

Hello there, TuckerMcP.

It sounds like you are looking to use a 4K display with your MacBook Pro Retina using your HDMI connection. The following Knowledge Base article offers up some great information in regard to compatibility and options for using 4K Displays with your Mac:

Using 4K displays and Ultra HD TVs with your Mac - Apple Support

Supported displays and configurations

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)
• MacBook Air (Early 2015)
• MacBook (Retina, 12-inch, Early 2015)

HDMI

You can use 4K displays and Ultra HD TVs at the following resolutions and refresh rates when connected via the built-in HDMI port:

• 3840x2160 at 30 Hz refresh rate
• 4096x2160 at 24 Hz refresh rate (mirroring is not supported at this resolution)

The MacBook (Retina, 12-inch, Early 2015) supports the displays and rates listed above when connected to the display with a USB-C Digital AV Multiport Adapter.

Single-Stream (SST) displays

With OS X Mavericks v10.9.3 or later, the following DisplayPort displays are supported at their default using single-stream transport at 30Hz:

• Sharp PN-K321
• ASUS PQ321Q
• Dell UP2414Q
• Dell UP3214Q
• Panasonic TC-L65WT600

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 and later)
• Mac Pro (Late 2013)
• iMac (27-inch, Late 2013 and later)
• MacBook Air (Early 2015)

With OS X Yosemite v10.10.3, most single-stream 4K (4096x2160) displays are supported at 60Hz operation on the following Mac computers:

• Mac Pro (Late 2013)
• iMac (Retina 5K, 27-inch, Late 2014 and later)
• MacBook Pro (Retina, 15-inch, Mid 2015) with AMD Radeon R9 M370X

Multi-Stream Transport (MST) Displays

These computers also support multi-stream transport (MST) displays at 60 Hz:

• MacBook Pro (Retina, 15-inch, Late 2013 and later)
• MacBook Pro (Retina, 13-inch, Early 2015)
• Mac Pro (Late 2013)
• iMac (Retina 5K, 27-inch, Late 2014 and later)

If you use a 60Hz MST display with the MacBook Pro (Retina, 15-inch, Late 2013) or iMac (Retina 5K, 27-inch, Late 2014), only one additional Thunderbolt display can be supported. Learn more about Thunderbolt ports and displays. You need to manually configure 4K displays to use MST. Follow the steps below to use the display's built-in controls to enable this feature.

• Sharp PN-K321: Choose Menu > Setup > DisplayPort STREAM > MST > SET
• ASUS PQ321Q: Choose OSD menu > Setup > DisplayPort Stream
• Dell UP2414Q and UP3214Q: Choose Menu > Display Setting > DisplayPort 1.2 > Enable
• Panasonic TC-L65WT600: Choose Menu > Display Port Settings > Stream Setting > Auto

Your Mac will automatically detect an MST-enabled display. However, your display may require a firmware update to support 60Hz operation. Please contact your display vendor for details. If your specific DisplayPort display is not listed above, check with the display’s manufacturer for compatibility information.

Dual-Cable Displays

Some displays with resolutions higher than 4K require two DisplayPort cables to connect the display at full resolution. With OS X Yosemite v10.10.3 or later, the Dell UP2715K 27-inch 5K display is supported on the following Mac computers:

• Mac Pro (Late 2013)
• iMac (Retina 5K, 27-inch, Late 2014 and later)
• MacBook Pro (Retina, 15-inch, Mid 2015) with AMD Radeon R9 M370X

Thanks for reaching out to Apple Support Communities.

Kind Regards.

I am owning a Macbook Air 11.1" (Early 2015) and regaring your post, mine does not have support of Multi-Stream Transport (MST) Displays?

Is that true?

I just purchased a EVGA MST (Displayport) Hub, but until now I can´t get it work if I want to connect more displays.

Anyone tried it out already?