I know for sure that Mac Pro late 2013 supports 4k screens flawlessly, but is HiDPI supported?
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1 Answer
My understanding is that when Apple is saying that a high DPI display is officially supported, they are implying that HiDPI mode is supported. See, for example, that in the article officially stating support for certain 4K displays for your Mac, they show a screenshot and state that you should be able to adjust scaling:
E.g., the Dell monitor cited in the article is quite a high pixel density since it shows 4K in a 24 inch diagonal. Running it without HiDPI would be quite challenging for most users.
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It appears that this was introduced in 10.9.3 for the Mac Pro: anandtech.com/show/7847/…– PaulJan 30, 2015 at 22:10
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Prior to 10.9.3 looks like it did run 4k displays without using HiDPI in some cases: digitaltrends.com/computing/…– PaulJan 30, 2015 at 22:14