HDMI 1.4b 144hz?

[Skozy]

So to my understanding is that the 1.4b hdmi cable can run 144hz on a monitor. Would 144hz work if I connect my laptop and monitor with a 1.4b hdmi cable? I am also wondering if the hdmi 1.4b cable works the same in any hdmi port. I have a lenovo y510p if that helps, thanks!

 

[boju]

1.4b theoretically can achieve 1080p @ 120Hz (not 144Hz) for 3D but doesn't say if 2D is supported. HDMI is very finicky when it comes to high Hz in 2D, it either works or it doesn't. The 3D aspect is more likely 60Hz x 2, to reach 120Hz in 2D you might need to run it in 720p. There is no definite answer and many unanswered questions.

My suggestion is, pickout a monitor you know has HDMI 1.4b and see if a computer store has one on display and try before you buy. For HDMI version 1.4b spec to work, the monitor and cable need to be 1.4b.

 

[boju]

Found another recent thread relating to the same laptop, i'll link the two back and forth and hope for a better outcome.

http://www.tomshardware.com/answers/id-2803478/hdmi-144hz.html

 

[GObonzo]

if the display and the output can both handle running 1.4 standard then it should work to 120Hz.

not sure if an older model 120Hz display built for use with HDMI 1.2 can make use of the 1.4 features. most were limited to DVI-D or DP for >60Hz. if it turns out to be only based on the cable's version then i will be upgrading to HDMI 1.4 this week for my 3D-HDTV.

 

[boju]

There are restrictions, outputs/inputs and cable need to be the same version. HDMI 1.4a and below cannot do 120Hz, it seems wiki says otherwise but not sure how accurate it is.

http://www.audioholics.com/hdtv-formats/understanding-difference-hdmi-versions

HDMI 1.4b
Release Date: October 2011

Specs:

Enabled 3D 1080p video at 120 Hz so that each eye can receive full HD (1080p 60Hz—or 120 Hz total) per Eye

Abstract: An incremental change to allow for Full HD (1080p) viewing of 3D content.

Practical Issues and tips: Allows for 3D content to be viewed in full HD.

According to Audioholics, 60Hz feature in both eyes for 3D was added to v1.4b, so prior versions doesn't look to be supported.

 

[GObonzo]

There are restrictions, outputs/inputs and cable need to be the same version. HDMI 1.4a and below cannot do 120Hz, it seems wiki says otherwise but not sure how accurate it is. 60Hz feature in both eyes for 3D was added to v1.4b, so prior versions doesn't look to be supported.

what boju posted is what i have always read from TriDef's user info and LG's 3DCinema support.

some monitors running HDMI 1.4a have reviews claiming they put out 120Hz. but those can be misleading because they can leave out the fact that you will have to use DP cables instead of HDMi to achieve it.

seeing more articles claiming it had to 1.4b on both ends have kept me from testing.

 

[Suzuki@1473780084@1473780163]

HDMI 1.4b can't do 1080/120, it's exactly what boju first said, 60/60 for right and left eye, using a technique called frame packing, specifically for viewing 3D. HDMI 2.0 can do 1080/120, but not 1080/144. And I should add, HDMI is more of a consumer app cable, shouldn't really be compared to "PC" cables, they have different purpose to why they exist. Basically what I'm trying to say, is that Frame packing is HDMI only, not DisplayPort, even though you might think it is. If it's mentioned, it's not related to 3D.

 

[GObonzo]

HDMI 1.4b can't do 1080/120, it's exactly what boju first said, 60/60 for right and left eye, using a technique called frame packing, specifically for viewing 3D. HDMI 2.0 can do 1080/120, but not 1080/144. And I should add, HDMI is more of a consumer app cable, shouldn't really be compared to "PC" cables, they have different purpose to why they exist. Basically what I'm trying to say, is that Frame packing is HDMI only, not DisplayPort, even though you might think it is. If it's mentioned, it's not related to 3D.

"some monitors running HDMI 1.4a have reviews claiming they put out 120Hz. but those can be misleading because they can leave out the fact that you will have to use DP cables instead of HDMi to achieve it." this is not in reference to 3D. it is referring to Skozy's original question.

 

[bystander]

The cable itself will work, but the problem is not the cable, but the port. HDMI 1.4b ports only handle 120hz at 1080p in frame packing mode. Frame packing is only used in HD3D. This is done by sending a right and left eye image in one transmission. This does not work for 2D (most all gaming).

https://en.wikipedia.org/wiki/HDMI

HDMI 1.4b was released on October 11, 2011.[143] One of the new features is that it adds the ability to carry 3D 1080p video at 120 Hz – allowing frame packing 3D format at 1080p60 per Eye (120 Hz total).[144] All future versions of the HDMI specification will be made by the HDMI Forum that was created on October 25, 2011.[40][145]

There are only 4 types of HDMI cables. High speed and standard with ethernet support or not for both. If they advertise it as HDMI 1.4b, it is only for marketing purposes.

 

[boju]

Thanks bystander that makes more sense. I mean if they brought out cables to specific standard, a's, b's and c's yadda yadda would be hell confusing and a lot of cables.