Yosemite gets enhanced 4K, support for Dell’s 5K monitor with OS X 10.10.3

While Apple’s new Photos app and a ton of new emoji stole the limelight when OS X 10.10.3 rolled out to the public last week, there were a number of significant changes under the hood that went unnoticed — including enhanced 4K compatibility, support for Dell’s 5K monitor, and a new protocol that delivers faster SSD performance.
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