OS X 10.10.3 brings enhanced 4K support (including 12-inch MacBook), adds 5K Dell for Mac Pro/iMac
Apple has expanded support for 4K displays in its recent OS X 10.10.3 release and officially confirmed specifics for using 4K displays with its new 12-inch MacBook.
While previously Apple only officially supported certain Multi-Stream Transport (MST) displays at a refresh rate of 60Hz, it now says that “most single-stream 4K (3840×2160) displays” are officially supported at 60Hz as well following the recent OS X Yosemite v10.10.3 update. That should mean support for a lot more inexpensive 4K displays that don’t include DisplayPort’s Multi-Stream Transport feature.
A full list of Macs that will support Single-Stream (SST) displays with a 60Hz refresh rate include:
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