Does cable matter for 4k 60hz via HDMI?

[thecreativename]

I'm trying to hookup my mid 2014 MacBook Pro(GT 750m) to my 4k samsung TV.

 

The TV itself has HDMI 2.0 support(KU6300) and I know my MacBook Pro doesn't support HDMI 2.0, and only HDMI 1.4. So I'd need to use the mini display port to get UHD@60hz. So I bought a cable that does mini display port to HDMI (not sure on the number for the HDMI).

 

When I run windows, I can set the resolution to 3840x2160 at 60hz through the Nvidia drivers, I don't have to create a custom profile or anything, 60hz is there as an option. But when I try to use MacOS sierra, I can only get 30hz. 

 

I think its weird that I can get 60hz in windows, but on MacOS. Would Getting a HDMI 2.0 cable help?

This is what my window looks like in Mac OS

http://imgur.com/a/ZVdPO

[thecreativename]

1 minute ago, rrubberr said:

No, because a GT 750m isn't going to be pushing 60fps at 4k while showing a desktop.

It works just fine in windows 10. It just doesn't seem to work on Sierra.

[thecreativename]

6 minutes ago, rrubberr said:

"Best for Samsung" doesn't properly auto detect?

No. All it does set it at an unscaled 3840x2160 @30hz.

[Glenwing]

A basic DisplayPort to HDMI cable will only give you HDMI 1.4, not HDMI 2.0.

 

In Windows, most likely it is using YCbCr 4:2:0 chroma subsampling to get 4K 60 Hz. You can test it by opening this image; each line of text should only be a single color, but if the text lines appear to have 2 different colors each, and especially if the last two lines appear blurry or unreadable, then chroma subsampling is being used. 

[thecreativename]

On 1/16/2017 at 4:25 AM, Glenwing said:

A basic DisplayPort to HDMI cable will only give you HDMI 1.4, not HDMI 2.0.

 

In Windows, most likely it is using YCbCr 4:2:0 chroma subsampling to get 4K 60 Hz. You can test it by opening this image; each line of text should only be a single color, but if the text lines appear to have 2 different colors each, and especially if the last two lines appear blurry or unreadable, then chroma subsampling is being used. 

Thank you for the information. I guess the cable really was the issue then. Would getting an active adapter help? (Active Mini DisplayPort to HDMI 2.0 adapter) and then use a regular HDMI cable.

[Glenwing]

7 hours ago, thecreativename said:

Thank you for the information. I guess the cable really was the issue then. Would getting an active adapter help? (Active Mini DisplayPort to HDMI 2.0 adapter) and then use a regular HDMI cable.

Yes, that should work.