That’s not drastically more expensive than something like the well-regarded U2412M, which usually goes for around $300. Our choice, Dell’s 24-inch P2415Q, has only been on the market since December, and since then they’ve fallen from an MSRP of $600 to just south of $500. Using a single video stream (SST, or Single Stream Transport) is a cleaner solution, and luckily 60Hz 4K SST monitors are becoming more common and less expensive. If a given GPU can support a total of four displays, for example, using an MST connection eats up two streams and limits you to a total of three displays. While the DisplayPort 1.2 spec allows multiple DisplayPort streams to be sent over a single cable, using two video streams in this way does cut down on the number of monitors you can have attached to your system. If you’re a 2015 MacBook Air owner looking for more information about buying a 4K display, here’s what we can tell you.
#BEST 4K MONITOR FOR MAC 2017 PRO#
Both Airs and the Pro had also made the jump to Thunderbolt 2, which explicitly supports DisplayPort 1.2.
Intel’s documentation tells us that the new Broadwell-U processors and their integrated GPUs support output of up to 3840×2160 at 60Hz when connected using DisplayPort 1.2, where the Haswell versions were capped at 30Hz (4K over HDMI remains capped at 24Hz, a limitation of the HDMI 1.4 spec). That’s because unlike last year’s Airs and 13-inch Pro (and all older DisplayPort and Thunderbolt Macs), the new versions of the laptops have the correct combination of hardware that makes 60Hz 4K output possible. Last year’s Air connected to the same display with the same cable can manage, at best, a blurry 2560×1440. The short answer is that yes, both the Pros and Airs now support 4K output at 60Hz using a single DisplayPort 1.2 cable. We were fairly sure that Apple’s spec page was incorrect, but to get a definitive answer we dove into the still-nascent 4K display ecosystem to do some testing.
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