Can anyone tell me why I'm not getting any resolutions above 1080p? trying to get to 4k.
[…]
My rMBP with the same cable to the same port on the TV gives me 3840x2160 but its very slow, but the Mac Pro doesn't show any available resolutions beyond 1080p, I assumed the 970 was 4k capable.
About the rMBP: I have the retina MacBook Pro late 2013. It works fine with the Ultra HD resolution on the UHD Philips 40" monitor, but only on 60 Hz via either of the mini Display Port connectors. Which are the same as the Thunderbolt connectors. The rMBP also does UHD over HDMI but only up to 24 Hz, because it only supports up to HDMI 1.4, not HDMI 2.0. Wikipedia has a table that compares specifications of HDMI standards.
Not sure what model rMBP you have but this also counts for the 2014 and (so far) 2015 rMBP models.
For future models reference: The current rMBP specs on maximum resolution via HDMI can be found on Apple's site, page about the retina MacBook Pro:
HDMI video output
Support for 1080p resolution at up to 60Hz
Support for 3840-by-2160 resolution at 30Hz
Support for 4096-by-2160 resolution at 24Hz
Last edited: