DisplayPort 1.4 hubs?

[Marinatall_Ironside]

Hello

 

Just wanted to ask if there's going to be any DisplayPort 1.4 hubs that can drive up to three displays off of one DisplayPort connection from the GPU. I just wanted to know because I want to try Nvidia Surround in the near future once I start acquiring monitors with the new DisplayPort 1.4 input specification which can drive 8K @ 60 Hz and 4K @ 144 Hz.

 

What I could find on the market are the ones with the DisplayPort 1.2 specification, which really limits what resolution and refresh rate can be achieved off of one connection.

[chris76816]

How many display port inputs do you have on your gpu. Their are usually three.

[dnf]

https://www.amazon.co.uk/DisplayPort-Multi-Monitor-Splitter-3-Port/dp/B00JLRBB8I/ref=sr_1_1?ie=UTF8&qid=1491169026&sr=8-1&keywords=displayport+hub+3+port

[Oshino Shinobu]

There will be, but it will take a while as the display industry needs to catch up (and the GPU market, as 3x 4K is a hell of a lot to push)

[Oshino Shinobu]

Just now, dnf said:

https://www.amazon.co.uk/DisplayPort-Multi-Monitor-Splitter-3-Port/dp/B00JLRBB8I/ref=sr_1_1?ie=UTF8&qid=1491169026&sr=8-1&keywords=displayport+hub+3+port

That's a 1.2 hub, OP is asking for DP 1.4. 

[Marinatall_Ironside]

I've got three on my GTX 960 4GB.

 

The reason why I'm asking is I'm also considering one of Asus' GPUs for my upgrade to the GTX 1080 Ti, but the problem is they dropped one of the DisplayPort interfaces for an extra HDMI connection. I know it's hella expensive, but It'll work well, aesthetic wise with my Rampage V Edition 10.

[Hiryuu]

that's way too soon for specific ic to be made the spec was finalise and publish only 1years ago 1march 2016 (if i'm not mistaken)

 

EDIT: I'm trying to find the total capability of MST(Multi Stream Transport) on DP1.4 so see if it's even possible.

 

EDIT2: Since DP seems to not be a free nor open standard getting that info is proving difficult !!!

 

EDIT3: OK that's not possible the standards achieve 8K @60hz using HBR3 (that compression) it can only do 8K @30hz on HBR2 (less compression), so MST with all overhead removed only allow for 4K UHD (3840) on two screen with HBR3. (here and here the source for that)

 

EDIT4: DP1.4 is basically DP1.3 with more feature and error handling

[Glenwing]

34 minutes ago, Hiryuu said:

that's way too soon for specific ic to be made the spec was finalise and publish only 1years ago 1march 2016 (if i'm not mistaken)

 

EDIT: I'm trying to find the total capability of MTS on DP1.4 so see if it's even possible.

 

EDIT2: Since DP seems to no be a free nor open standard getting that info is proving difficult !!!

It's free to VESA members, which is every company who wants to implement it, but not to the general public.

 

DisplayPort 1.4 has 50% more bandwidth than DP 1.2.

 

The max on a single port is:

1× 2560×1440 at 240 Hz

1× 3840×2160 at 120 Hz

 

2× 2560×1440 at 120 Hz

2× 3840×2160 at 60 Hz

 

3× 1920×1080 at 144 Hz

3× 2560×1440 at 90 Hz

 

4× 1920×1080 at 120 Hz

4× 2560×1440 at 60 Hz

 

Assuming 24 bit/px RGB color, no compression, etc.

[Marinatall_Ironside]

Just now, Glenwing said:

3× 1920×1080 at 144 Hz

3× 2560×1440 at 90 Hz

Well damn, that means no 4K 144 Hz off of one DP 1.4 hub due to bandwidth limitations. If I wanted to (which I can, but not necessary) try Nvidia Surround with 4K displays, no way at all 

[Hiryuu]

 

22 minutes ago, Glenwing said:

It's free to VESA members, which is every company who wants to implement it, but not to the general public.

The membership to VESA is not free, the standards is royalty free to implement to members but some feature need licensing fro MPEG LA..

 

EDIT: correction my misunderstanding of the licencing of DP standard

[Glenwing]

1 minute ago, JurunceNK said:

Well damn, that means no 4K 144 Hz off of one DP 1.4 hub due to bandwidth limitations. If I wanted to (which I can, but not necessary) try Nvidia Surround with 4K displays, no way at all 

Yes, although I think some display will use DSC compression to get 4K 144 Hz.

[Marinatall_Ironside]

1 minute ago, Glenwing said:

Yes, although I think some display will use DSC compression to get 4K 144 Hz.

Will that affect the overall image quality?

[Glenwing]

9 minutes ago, Hiryuu said:

 

The membership to VESA is not free, the standards is royalty free to implement to members but some feature need licensing for MPEG LA..

MPEG-LA is a patent troll. VESA has commented on this matter.

 

MPEG LA is making claims that DisplayPort implementation requires a license and a royalty payment. It is important to note that these are only claims. Whether these claims are relevant will likely be decided in a US court.

 

[Hiryuu]

Just now, Glenwing said:

MPEG-LA is a patent troll. VESA has commented on this matter.

 

 

 

 

Just corrected it as same time as you posted it

[Glenwing]

19 minutes ago, JurunceNK said:

Will that affect the overall image quality?

Not noticeably. I don't know how DSC interacts with MST though, and also it won't be usable for using hubs with any current monitors since no monitors support DP 1.4 yet.

1 minute ago, Hiryuu said:

Just corrected it as same time as you posted it

lol

[Marinatall_Ironside]

3 minutes ago, Glenwing said:

Not noticeably. I don't know how DSC interacts with MST though, and also it won't be usable for using hubs with any current monitors since no monitors support DP 1.4 yet.

Yeah. The ROG Swift PG27UQ should come out with DP 1.4, but none of us know when this will come out. Would want one though, with the nitpicky part being the screen size (It should be 32 inches (or Asus should make a 32 inch option for those with more desk space)), otherwise everything else is excellent. I wouldn't want 144 Hz at 4K resolution (but it's nice to have on there), considering that 4K is still brutal on even the beefiest GPUs. The biggest selling point IMO is the HDR support.

Edited April 2, 2017 by JurunceNK
Ninja-edit

[Glenwing]

1 minute ago, JurunceNK said:

Yeah. The ROG Swift PG27UQ should come out with DP 1.4, but none of us know when this will come out. Would want one though, with the nitpicky part being the screen size (It should be 32 inches (or Asus should make a 32 inch option for those with more desk space)), otherwise everything else is excellent. I wouldn't want 144 Hz at 4K resolution (but it's nice to have on there), considering that 4K is still brutal on even the beefiest GPUs. The biggest selling point IMO is the HDR support.

Yeah, although monitors are typically something you keep for a long time, so a bit of overkill isn't necessarily a waste

[Marinatall_Ironside]

1 minute ago, Glenwing said:

Yeah, although monitors are typically something you keep for a long time, so a bit of overkill isn't necessarily a waste

Yeah. My BenQ monitor should last me a good while. Will use it as my new secondary display once I somehow manage to snag one, but I would prefer if it were in 32 inches.

[Hiryuu]

8 minutes ago, Glenwing said:

Not noticeably. I don't know how DSC interacts with MST though, and also it won't be usable for using hubs with any current monitors since no monitors support DP 1.4 yet.

DSC is used in MST because DSC 1.2 is what enable HBR3 mode to exist  so DSC 1.2 is used in MST (on the stream that compose it ) 

 

i have the full spec but i don't think i can post /link it here for obvious reason but some google-fu (filetype and inurl) you should be able to find it too

[Glenwing]

7 minutes ago, Hiryuu said:

DSC is used in MST because DSC 1.2 is what enable HBR3 mode to exist  so DSC 1.2 is used in MST (on the stream that compose it ) 

 

i have the full spec but i don't think i can post /link it here for obvious reason but some google-fu (filetype and inurl) you should be able to find it too

DSC isn't used for HBR3, considering it existed before DSC 1.2 existed. It can be used in conjunction with HBR3 though.

[Hiryuu]

8 minutes ago, Glenwing said:

DSC isn't used for HBR3, considering it existed before DSC 1.2 existed.

i know you were gonna respond that i'm not clear enough (my bad ) i said 'HBR3 MODE' not HBR3 (HBR design the link speed that's all) with that link speed there is mode.

the specific one that achieve 4K UHD stereoscopic (1 @ 120 or 2 @60hz) use DSC 1.2 the max uncompressed is 5K x 3K

[Glenwing]

6 minutes ago, Hiryuu said:

i know you were gonna respond that i'm not clear enough (my bad ) i said 'HBR3 MODE' not HBR3 (HBR design the link speed that's all) with that link speed there is mode.

the specific one that achieve 4K UHD stereoscopic (1 @ 120 or 2 @60hz) use DSC 1.2 the max uncompressed wo/ DSC 1.2 is 5K + 3K on MST 

I'm very confused by what you're saying. Without using DSC, the maximum on DP 1.3/1.4 is 4K (3840×2160) at 120 Hz, 5K (5120×2880) at 60 Hz, or 8K (7680×4320) at 30 Hz. When DSC is used, you can go to refresh rates around three times as high.

[Hiryuu]

Wo/ DSC :

you can do:

5120 × 2880 @60HZ MAX 

 

With DSC :

7680 × 4320 @60HZ MAX

 

[Glenwing]

1 minute ago, Hiryuu said:

Wo/ DSC :

you can do:

5120 × 2880 @60HZ MAX 

 

With DSC :

7680 × 4320 @60HZ MAX

 

Yeah, but 5120×2880 @ 60 Hz is roughly equivalent to 3840×2160 @ 120 Hz, you don't need DSC for either of them.

[Hiryuu]

21 minutes ago, Glenwing said:

Yeah, but 5120×2880 @ 60 Hz is roughly equivalent to 3840×2160 @ 120 Hz, you don't need DSC for either of them.

yes if it's a single stream but with the overhead of MST it doesn't fit

 

EDIT: it's 1h30 am  (sorry) the spec sheet is hard to read, ok so i read it wrong (that not obvious) ok in their exemple they stated an overhead of 1.6% using MST (and before stated 0.8% for SST) but that not per say what break it it's the detail i didn't catch that in their MST table the stream are all in 10bit w/HDR that why they need DSC.