4 ms·

I think it supports 4K but not at 60 fps. You are stuck at 30 fps.

Ductapemaster 7y ago
I have a 2015 and a 4K monitor and can confirm that this is the case. 30fps isn't great but it is usable for most day-to-day computer work. However there is a workaround if you are willing to disable SIP and play around with a program called SwitchResX. You can customize the display timings in such a way that allows 4K60 video to just sneak in under the bandwidth limits of the Thunderbolt ports. It also requires a Thunderbolt to HDMI 2.0 adapter, and a compatible monitor. If you like fiddling around this is one way to do it, but I have found it finicky and not really worth it.
- jordanthoms 7y ago
  4k60hz is also possible over displayport, on my Late 2013 mbp I need to use switchresx to get it going (but I've found that pretty set-and-forget), but on the newer ones than that it works without any hacks AFAIK
  - notvplez 7y ago
    Could you share some details about how you do this? Do you need displayport on both ends, and is it a monitor or TV? I have the same machine and a 4K TV with only HDMI-inputs and am curious if I can achieve this is in some way. Switchresx looks really useful anyway, so thank you for that. :)
    - alanfranz 7y ago
      There's no HDMI 2.0 support in 2015 MBPr AFAIK. So no 4k@60Hz over HDMI. You must get DP.
    - jordanthoms 7y ago
      If you have a Displayport display, you can use a displayport to mini displayport cable, use switchresx, should work good. If it's HDMI only, as the sibling pointed out the HDMI port won't work. However, Startech makes a displayport to HDMI adapter which works ( https://www.amazon.com/DisplayPort-HDMI-Adapter-Converter-60Hz/dp/B01M6WK3KU https://www.amazon.com/DisplayPort-HDMI-Adapter-Converter-60... ) (just make sure you get one which supports 4k60hz, most DP -> HDMI adapters don't).
      - notvplez 7y ago
        I'll consider this though I it would be probably be sitting unused after trying it anyway as I really have no need for it. Thank you for the information. Just to clarify, we're both talking about a late 2013 macbook pro retina? The other helpful commenter mentions the 2015.
        jordanthoms 7y ago
        Yeah, this is all on the late 2013 15" with the nvidia dgpu - https://support.apple.com/en-us/HT206587 https://support.apple.com/en-us/HT206587 has the official details on this BTW - they state that SST Displayport 3840 x 2160 displays are only supported at 60hz on the 15" from Mid 2014 on, but it actually works on the Late 2013 also with Switchresx.
- chjdev 7y ago
  also got a 2015 and 4k @60hz is possible plug and play with a thunderbolt to displayport cable. anything other than default scaling gets a bit choppy though
- shrimpx 7y ago
  2015 can drive 4k at 60hz over displayport if the monitor supports displayport. HDMI output is limited 30hz afaik.

I have a 2015 and a 4K monitor and can confirm that this is the case. 30fps isn't great but it is usable for most day-to-day computer work. However there is a workaround if you are willing to disable SIP and play around with a program called SwitchResX. You can customize the display timings in such a way that allows 4K60 video to just sneak in under the bandwidth limits of the Thunderbolt ports. It also requires a Thunderbolt to HDMI 2.0 adapter, and a compatible monitor. If you like fiddling around this is one way to do it, but I have found it finicky and not really worth it.

jordanthoms 7y ago
4k60hz is also possible over displayport, on my Late 2013 mbp I need to use switchresx to get it going (but I've found that pretty set-and-forget), but on the newer ones than that it works without any hacks AFAIK
- notvplez 7y ago
  Could you share some details about how you do this? Do you need displayport on both ends, and is it a monitor or TV? I have the same machine and a 4K TV with only HDMI-inputs and am curious if I can achieve this is in some way. Switchresx looks really useful anyway, so thank you for that. :)
  - alanfranz 7y ago
    There's no HDMI 2.0 support in 2015 MBPr AFAIK. So no 4k@60Hz over HDMI. You must get DP.
  - jordanthoms 7y ago
    If you have a Displayport display, you can use a displayport to mini displayport cable, use switchresx, should work good. If it's HDMI only, as the sibling pointed out the HDMI port won't work. However, Startech makes a displayport to HDMI adapter which works ( https://www.amazon.com/DisplayPort-HDMI-Adapter-Converter-60Hz/dp/B01M6WK3KU https://www.amazon.com/DisplayPort-HDMI-Adapter-Converter-60... ) (just make sure you get one which supports 4k60hz, most DP -> HDMI adapters don't).
    - notvplez 7y ago
      I'll consider this though I it would be probably be sitting unused after trying it anyway as I really have no need for it. Thank you for the information. Just to clarify, we're both talking about a late 2013 macbook pro retina? The other helpful commenter mentions the 2015.
      - jordanthoms 7y ago
        Yeah, this is all on the late 2013 15" with the nvidia dgpu - https://support.apple.com/en-us/HT206587 https://support.apple.com/en-us/HT206587 has the official details on this BTW - they state that SST Displayport 3840 x 2160 displays are only supported at 60hz on the 15" from Mid 2014 on, but it actually works on the Late 2013 also with Switchresx.
chjdev 7y ago
also got a 2015 and 4k @60hz is possible plug and play with a thunderbolt to displayport cable. anything other than default scaling gets a bit choppy though
shrimpx 7y ago
2015 can drive 4k at 60hz over displayport if the monitor supports displayport. HDMI output is limited 30hz afaik.