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My personal computer is a 2015 and my work is a 2017, and there are zero features from the 2017 that I prefer. 4k@60Hz. The MacBook Pro 2015 with Intel Iris (I

My personal computer is a 2015 and my work is a 2017, and there are zero features from the 2017 that I prefer. 4k@60Hz. The MacBook Pro 2015 with Intel Iris (I don't know about the Radeon GPU) only supports 4k@30Hz, which is terrible. (My wife has the 1st gen MacBook 12", which has the same downside.)

nik736 8y ago
My 2017 13-inch nTB MBP is running 4k@60Hz just fine.
ianhowson 8y ago
> only supports 4k@30Hz, which is terrible Are you using the HDMI port? I'm using a 2015 with Iris and can run 4k@60Hz through the mini-DP. https://support.apple.com/en-us/HT206587 https://support.apple.com/en-us/HT206587 shows that both 13" and 15" from 2015 should support 4k@60Hz.
subraizada3 8y ago
I recently bought a used 2013 MBP; while Apple specs say it can only do 4k@30, the DisplayPort output is in fact capable of 4k@60.
- yhoiseth 8y ago
  Do you have to tweak anything to achieve this?
  - subraizada3 8y ago
    No, it worked out of the box on the 15" model. The GPU must have a HDMI 2.0 output for 4k@60, and this is usually not present on all but the most recent laptops, producing the 30 Hz limitation. On the other hand, DisplayPort 1.2 supports 4k@60. This is built into the Thunderbolt 2 ports on Macs, so as long as the GPU supports DP 1.2 it will work. On my MBP (15"), the DP(Thunderbolt) + HDMI ports are wired directly to the Nvidia GPU. Parent mentioned his computer only had the Intel Iris graphics (13" model), which apparently can't do 4k@60 (so my previous comment was incorrect :( ).
lurker82 8y ago
there is a patch you can apply to some kexts to get around this and support 4k@60hz
- saagarjha 8y ago
  I was under the impression that this was a bandwidth issue for the HDMI port, so I'm curious to see how a kernel extension would get around this issue.
  - lurker82 8y ago
    https://github.com/Floris497/mac-pixel-clock-patch-V2 https://github.com/Floris497/mac-pixel-clock-patch-V2 I came across this while looking to see if I could buy a 4k display for my 12" Macbook (2nd gen.). My brief reading of it implied that it would be possible to drive it at 60hz. but maybe you are correct.
    - saagarjha 8y ago
      Looks like it might require an extra graphics card, or something like that? I haven't looked into it in detail, but it doesn't look like this thing works on a MacBook.
    - bluedino 8y ago
      LG 4K over usb-c They are really cheap used or refurb
tobyhinloopen 8y ago
All 2015 macbook pros (13", 15", with or without dedicated gpu) support 1 or 2 4K 60Hz displays on using a displayport 1.2 compatible monitor
Rebelgecko 8y ago
My 2015 MBP drives two 4k monitors at 60hz just fine. Well, not just fine— sometimes it randomly forgets which monitor is which. But the GPU is powerful enough.

nik736 8y ago

My 2017 13-inch nTB MBP is running 4k@60Hz just fine.

ianhowson 8y ago

> only supports 4k@30Hz, which is terrible Are you using the HDMI port? I'm using a 2015 with Iris and can run 4k@60Hz through the mini-DP. https://support.apple.com/en-us/HT206587 https://support.apple.com/en-us/HT206587 shows that both 13" and 15" from 2015 should support 4k@60Hz.

subraizada3 8y ago

I recently bought a used 2013 MBP; while Apple specs say it can only do 4k@30, the DisplayPort output is in fact capable of 4k@60.

yhoiseth 8y ago
Do you have to tweak anything to achieve this?
- subraizada3 8y ago
  No, it worked out of the box on the 15" model. The GPU must have a HDMI 2.0 output for 4k@60, and this is usually not present on all but the most recent laptops, producing the 30 Hz limitation. On the other hand, DisplayPort 1.2 supports 4k@60. This is built into the Thunderbolt 2 ports on Macs, so as long as the GPU supports DP 1.2 it will work. On my MBP (15"), the DP(Thunderbolt) + HDMI ports are wired directly to the Nvidia GPU. Parent mentioned his computer only had the Intel Iris graphics (13" model), which apparently can't do 4k@60 (so my previous comment was incorrect :( ).

lurker82 8y ago

there is a patch you can apply to some kexts to get around this and support 4k@60hz

saagarjha 8y ago
I was under the impression that this was a bandwidth issue for the HDMI port, so I'm curious to see how a kernel extension would get around this issue.
- lurker82 8y ago
  https://github.com/Floris497/mac-pixel-clock-patch-V2 https://github.com/Floris497/mac-pixel-clock-patch-V2 I came across this while looking to see if I could buy a 4k display for my 12" Macbook (2nd gen.). My brief reading of it implied that it would be possible to drive it at 60hz. but maybe you are correct.
  - saagarjha 8y ago
    Looks like it might require an extra graphics card, or something like that? I haven't looked into it in detail, but it doesn't look like this thing works on a MacBook.
  - bluedino 8y ago
    LG 4K over usb-c They are really cheap used or refurb

tobyhinloopen 8y ago

All 2015 macbook pros (13", 15", with or without dedicated gpu) support 1 or 2 4K 60Hz displays on using a displayport 1.2 compatible monitor

Rebelgecko 8y ago

My 2015 MBP drives two 4k monitors at 60hz just fine. Well, not just fine— sometimes it randomly forgets which monitor is which. But the GPU is powerful enough.