Apple has seeded the first beta of OS X Mavericks 10.9.3 to developers for testing, just a few weeks after releasing 10.9.2 to the public. The build number is 13D12 and focus areas include Graphics Drivers and Audio.
The last Mavericks update, OS X 10.9.2, added FaceTime Audio, the ability to block iMessage users on the Mac, and a fix for a critical SSL vulnerability. 10.9.2 saw a beta testing period of approximately two months, and it is likely 10.9.3 will also see several beta iterations before a public release.
Before this update, users with Macs connected to a 4K display would simply experience their content on a larger scale with window elements spread out. Macs on 4K displays essentially were given ~4000 lines of room to accomplish their tasks. Prior to this 10.9.3 beta, users have solely been able to run their Macs at a Retina/pixel-doubled resolution using unofficial hacks.
Khaos Tian was able to confirm OS X 10.9.3 brings support for 4K@60Hz on the new Mac Pro and the Retina Display MacBook Pro (late 2013).
Apple has yet to release a 4K monitor of its own. Hopefully these improvements bring us a little closer to that happening.
via 9to5mac
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