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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

What large 4k computer screen does 50hz

Hmm... More problems.
Apparently 10m HDMI does not only have the limitation that some of them do not do more than 30Hz there is HDMI cables at 10m length that doe 60Hz but they can not do more than 422 in 4k so colors are simply smeared in horisontal and especially bad is the blue channel.

I tested 3 cables one that claims it was full HDMI 2.0 and that it supported 4k 60Hz... it simply did not, no picture in 60Hz 4444.

Then we tested a monster cable that we had in shop, got all happy and thought it worked but at closer inspection, no it only does 422 and colors are smeared and especially coloured gui elements get a colorfringing edge due to this. Then we tested a brand new monster cable that also says "does it all" on the package. Well it does not do 4444 from the GPU.


The screen we are settling for is the Samsung 40" led 4k screen which is rather good but this 422 stuff is simply shit. So need to find active cables that actually do what they claim.
 
Björn Benckert said:
Hmm... More problems.
Apparently 10m HDMI does not only have the limitation that some of them do not do more than 30Hz there is HDMI cables at 10m length that doe 60Hz but they can not do more than 422 in 4k so colors are simply smeared in horisontal and especially bad is the blue channel.

I tested 3 cables one that claims it was full HDMI 2.0 and that it supported 4k 60Hz... it simply did not, no picture in 60Hz 4444.

Then we tested a monster cable that we had in shop, got all happy and thought it worked but at closer inspection, no it only does 422 and colors are smeared and especially coloured gui elements get a colorfringing edge due to this. Then we tested a brand new monster cable that also says "does it all" on the package. Well it does not do 4444 from the GPU.


The screen we are settling for is the Samsung 40" led 4k screen which is rather good but this 422 stuff is simply shit. So need to find active cables that actually do what they claim.
Click to expand...

Björn,

No HDMI 2.0x can do 4k, 10 bits, 60 Hz, 4444. Look at the HDMI specs, do the math and bingo.
Max bandwidth is 18x(8/10)=14,4 Gb/s
 
Misha Engel said:
Björn,

No HDMI 2.0x can do 4k, 10 bits, 60 Hz, 4444. Look at the HDMI specs, do the math and bingo.
Max bandwidth is 18x(8/10)=14,4 Gb/s
Click to expand...

Sure, very much possibly so but you need extremely good cables to do it over 10m. 15m they even state it does not work. So cable length is very much in play, short distances you could possibly do it on pretty much any cable 10m, not the same thing.

I got a Ti card in one end on windows 10 and a Samsung HDR screen in the other end and 10m cable in between from Monster, a directional cable that should be one of the better. No dice.
 
Björn Benckert said:
Sure, very much possibly so but you need extremely good cables to do it over 10m. 15m they even state it does not work. So cable length is very much in play, short distances you could possibly do it on pretty much any cable 10m, not the same thing.

I got a Ti card in one end on windows 10 and a Samsung HDR screen in the other end and 10m cable in between from Monster, a directional cable that should be one of the better. No dice.
Click to expand...

Then you're f*cked, the 10m cable I use, works perfect (AMD VEGA FE, €25 HDMI cable from the local electronics store, LG OLED 55 inch C7).
https://en.wikipedia.org/wiki/HDMI#Version_2.0 info about HDMI
 
Björn, wich Samsung 40" led 4k screen did you settle for.
 
Ok tested pretty much every cable available and length. Could it be so that the TI cards can only do 4:2:0 ? as there is a quite hefty smearing in both green and blue channels and when watching them separatly trough HDMI to the screen it´s simply low res in horisontal axis. I thought the Ti´s could do 4444 through HDMI. Any one have any clue about this?
 
Björn Benckert said:
Ok tested pretty much every cable available and length. Could it be so that the TI cards can only do 4:2:0 ? as there is a quite hefty smearing in both green and blue channels and when watching them separatly trough HDMI to the screen it´s simply low res in horisontal axis. I thought the Ti´s could do 4444 through HDMI. Any one have any clue about this?
Click to expand...

Which player are you using what is the file format and what is the bit-depth (8 or 10)?
With Davinci Resolve you need a declink card for 10 bit color output (doesn't work through GPU's).
 
Misha Engel said:
Which player are you using what is the file format and what is the bit-depth (8 or 10)?
With Davinci Resolve you need a declink card for 10 bit color output (doesn't work through GPU's).
Click to expand...

Im just trying to get the pc gui to show on screen in a desent way... So player is the 1080ti card. I did not know it only do 4:2:0. Which gives all typo and especially colored things a ghosting. Simply a ti card does not do 4k it only does it in one of the channels when going trough hdmi.
 
GUI should be no problem with 24 bit RGB (3x8). 3840x2160x3x8x60 = 11.94 Gb/s < 14.4 Gb/s
Have a look at NVidia's control settings it should work (can't help you with that I use the other brand).

GTX1080ti doesn't support 10 bit for you GUI, for that you need a Quadro or VEGA FE or Radeon Pro.
When you want to color grade with Davinci Resolve you will need a DecLink card if you want 10 bit color output, no matter what GPU you are using.
 
Misha Engel said:
GUI should be no problem with 24 bit RGB (3x8). 3840x2160x3x8x60 = 11.94 Gb/s < 14.4 Gb/s
Have a look at NVidia's control settings it should work (can't help you with that I use the other brand).

GTX1080ti doesn't support 10 bit for you GUI, for that you need a Quadro or VEGA FE or Radeon Pro.
When you want to color grade with Davinci Resolve you will need a DecLink card if you want 10 bit color output, no matter what GPU you are using.
Click to expand...


Im not talking about grading but the video feed to the screen from Ti's HDMI is simply not good it's makes rainbow color fringing around black text etc somthing I dont get when using the Wifi feed of the screen or the actual TV gui, that one is perfectly clean, what comes from the ti card HDMI on windows in 4k.... Not so much.
 
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