I was thinking of buying a 4K monitor and was told that while Mavericks supported 4K, Yosemite does not. Supposedly the best resolution that can be had is 3840 x 2160. Is this true, and if it is, then why? Thanks.
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Yosemite 4K Ready?
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Good point, so then it looks like mini displayport is the bottle neck.
For computers or Macs? Where can I find more information about this? I ask because all windows machines I've seen are 4096x2160@60Hz.
I'm a little disappointed with those refresh rates (although I'm not sure what refresh rate for 4K on Windows is) but then again, I won't be able to afford a 4K display for a while anyway
Forget the refresh rates...the display type isn't even correct!
After trying unsuccessfully to get my late-2012 Core i7 Mac Mini to recognize 50" and 55" UHD TVs from Samsung (they were all identified by the system as "30.5-inch displays" with a maximum resolution of 1920 x 1080), I got a 40" UHD TV from LG. Now the system thinks it's connected to a 73.5-inch display...with a maximum resolution of 1920 x 1080!!!
I opened a ticket with Apple a few weeks ago, but nothing back from them so far. The Mini has no problem driving any of these displays at their native resolution when running Windows, so I know it's not a hardware problem.
After trying unsuccessfully to get my late-2012 Core i7 Mac Mini to recognize 50" and 55" UHD TVs from Samsung (they were all identified by the system as "30.5-inch displays" with a maximum resolution of 1920 x 1080), I got a 40" UHD TV from LG. Now the system thinks it's connected to a 73.5-inch display...with a maximum resolution of 1920 x 1080!!!
I opened a ticket with Apple a few weeks ago, but nothing back from them so far. The Mini has no problem driving any of these displays at their native resolution when running Windows, so I know it's not a hardware problem.
My old Mac Pro works fine with my LG 4K TV under both Mavericks and Yosemite.
Anyway, did you try to manually set the resolution to 4K? I think the system will give you 1080 HiDPI by default. Which actually make sense. Even though my TV is 84", use native 4K resolution still make all icons and text looks quite small if I am at the "optimum" distance.
Anyway, the setting is in system preferences -> display -> scaled. If no 3840x2160 there, you can hold down the option key before you click "scaled". That should give you all available resolution to choose.
Thanks for the recommendations, but I've tried everything with absolutely no success. When I was running Mountain Lion, I had the option for 3840x2160 as well as 1080 HiDPI. Since upgrading, those options have all gone away. The system sees the 40" TV as having a maximum resolution of 1920x1080, and a screen size of 73.5". Obviously there is a problem with the way the OS interprets the EDID from some 4K TVs.
Incidentally, a lot has been made of whether or not the lowly Intel HD Graphics 4000 is capable of 4K support. I have two Dell desktops at work, one with HD Graphics 3000 and another with HD Graphics 4600, and both are able to drive a 39" UHD TV at 3840x2160 @ 30Hz. Both systems are connected using a DP to HDMI adapter; I've tried connecting the Mac Mini via an active Mini-DisplayPort to HDMI adapter as well as straight HDMI, but that does not seem to make a difference.