hdmimacbook prothunderbolt
Does the MacBook Pro (Retina, Mid 2012) output 2560×1600 to the HDMI port?
The reason I ask is that I would like to drive 2×30 inch 2560×1600 monitors while still using the Gigabit Ethernet adapter. (My backup plan is to get the USB 2 to 100 Mbit adapter and use that and then just use the Thunderbolt for graphics). So I would appreciate any additional caveats to this plan as well.
This MacRumors topic contains some useful info as well: http://forums.macrumors.com/showthread.php?t=1426993
What's officially "supported" and what's possible don't match. I have a late-2012 rMBP and got 4K out of it at 30Hz.
I took a screenshot as proof:
Just a normal mini-displayport<->displayport cable was used.
More details in my answer here: https://apple.stackexchange.com/a/147765/39878
or on this blog post: http://www.mattburns.co.uk/blog/2014/09/30/running-the-4k-aoc-u2868pqu-and-intel-hd4000-graphics/
Best Answer
If it's HDMI 1.4 as noted above, it should support "4k" resolution (4096×2160p24)
http://en.wikipedia.org/wiki/HDMI#Version_1.4