Samsung UHD TV cannot get 4:4:4 60Hz over HDMI

[TheAHan]

I have a 40" Samsung KU6300 for a PC monitor, and I love it except I cannot get 60Hz 4:4:4 out of it like rtings claims it can do: http://www.rtings.com/tv/reviews/samsung/ku6300

I am connecting it to an RX480 (Windows 10) via one of three HDMI cables I've tried (all supposedly 18GBps, two explicitly claiming 60Hz 4:4:4 capability), and none of them work as of now. I CAN get 4K @ 60Hz 4:2:2 and 4K @ 30Hz 4:4:4, but that's it. My TV is on PC mode and I have exhausted all TV settings trying to get it to work.

Questions:

1) Would an active Displayport to HDMI adapter do anything?
Such as this: http://www.club-3d.com/index.php/products/reader.en/product/displayport-12-to-hdmi-20-uhd-active-adapter.html

2) Could the locked Windows 10 True Color 32bit output (adapter mode) be clogging up the HDMI bandwidth? The TV is an 8bit panel so 32bit output is wayyy unnecessary, right?

3) Could it be an issue with my RX480 graphics card/crimson drivers? The RX480 has HDMI2.0b...

4) Any other suggestions of things I could try?

Thank you!

 

[basroil]

Your TV does not support HDMI2.0 properly according to the manufacturer (http://downloadcenter.samsung.com/content/UM/201605/20160504171541226/ENG_US-JZATSCK-1.1.7-160504.pdf) and can only display 60Hz with 4:4:4 at 8bit when you enable HDMI UHD Color option for that particular port. It does not support 10bit or 12bit color information except with 4:2:2

 

[TheAHan]

Your TV does not support HDMI2.0 properly according to the manufacturer (http://downloadcenter.samsung.com/content/UM/201605/20160504171541226/ENG_US-JZATSCK-1.1.7-160504.pdf) and can only display 60Hz with 4:4:4 at 8bit when you enable HDMI UHD Color option for that particular port. It does not support 10bit or 12bit color information except with 4:2:2

That's excellent to know! Thank you! That never occurred to me because whenever I am on 4K/60Hz and I turn HDMI UHD Color on, it bumps down to 4:2:0 from 4:2:2! Aurgh, I'll have to play around with that when I get home from work. Any idea why turning UHD Color on might make things look worse (4:2:0) by default? Could it be that HDMI UHD Color turns on a higher color depth than 8bit for whatever reason?

Thank you again!

 

[TheAHan]

I now have the TV on PC mode, HDMI1-in, and UHD Color on, and I still cannot get 4:4:4, only 4:2:2, it appears. I have tried two cables claiming to be 60Hz/4:4:4 capable. I have messed with the Radeon Additional Settings and it gives no pixel format options, and everything looks slightly washed out. If I set the Hz to 30, I can get that 4:4:4, but still not at 60Hz. Any other ideas?

 

[basroil]

I now have the TV on PC mode, HDMI1-in, and UHD Color on, and I still cannot get 4:4:4, only 4:2:2, it appears. I have tried two cables claiming to be 60Hz/4:4:4 capable. I have messed with the Radeon Additional Settings and it gives no pixel format options, and everything looks slightly washed out. If I set the Hz to 30, I can get that 4:4:4, but still not at 60Hz. Any other ideas?

Sounds like it's somehow not hitting 2.0 speeds, perhaps the TV and card have different supported systems. Try running the AMD software in administrator mode to see if they give additional options, if not you might have to make your own profile and hope nothing goes wrong.

 

[ebayguy2006]

I was in the same boat. I was using VLC player which just doesnt play 4k videos, or I have yet to find any one who knows any settings that work. Spent days upon days searching and testing everything. VLC has been displaying in 4:2:0 on me even if I ignore the jutter and such. There is a 4k image online that test if your in 4:4:4.

Selecting input one, than hitting either up or down, or holding the select button yeilds more options, select PC. unfortunately you lose options like game mode, UHD, high dynamic, and MORE!

Also you can only yeild 444 in 8bit.

So my question is what is better, 4:2:2 or lower with higher bit? and other options on tv become available like UHD & dynamic?

 

[TheAHan]

I was in the same boat. I was using VLC player which just doesnt play 4k videos, or I have yet to find any one who knows any settings that work. Spent days upon days searching and testing everything. VLC has been displaying in 4:2:0 on me even if I ignore the jutter and such. There is a 4k image online that test if your in 4:4:4.

Selecting input one, than hitting either up or down, or holding the select button yeilds more options, select PC. unfortunately you lose options like game mode, UHD, high dynamic, and MORE!

Also you can only yeild 444 in 8bit.

So my question is what is better, 4:2:2 or lower with higher bit? and other options on tv become available like UHD & dynamic?

I asked this question all over the place and forgot to update this thread... The issue was my AMD card. Full stop.

I got a GTX 1060, and it fixed every issue I was having.

1) Suddenly, out of the box, I get 4K/60Hz/4:4:4/RGB full range/8 bit (The Samsung TV is only an 8bit panel so no problem, and it looks great, quite vivid, I'm not wanting for more Bits so to speak)
2) No more random gray/black screens that require a reboot (this was really annoying because there was no way to recover, you just can't see what you were doing before)
3) My TV now STAYS on PC input mode, which is necessary for the settings mentioned above along with HDMI UHD color. With the AMD card it would change back every time the TV shut off.

So at this point, if you want a Samsung 4K/60Hz/4:4:4 TV (and quite possibly other brands) running from a computer, you need an NVidia graphics card. I couldn't even get 4K/60Hz/4:4:4 with limited RGB range out of my old RX 480. Like you, I spent days and tried everything. It sucks.

 

[CBRworm]

I was in the same boat. I was using VLC player which just doesnt play 4k videos, or I have yet to find any one who knows any settings that work. Spent days upon days searching and testing everything. VLC has been displaying in 4:2:0 on me even if I ignore the jutter and such. There is a 4k image online that test if your in 4:4:4.

Selecting input one, than hitting either up or down, or holding the select button yeilds more options, select PC. unfortunately you lose options like game mode, UHD, high dynamic, and MORE!

Also you can only yeild 444 in 8bit.

So my question is what is better, 4:2:2 or lower with higher bit? and other options on tv become available like UHD & dynamic?

I asked this question all over the place and forgot to update this thread... The issue was my AMD card. Full stop.

I got a GTX 1060, and it fixed every issue I was having.

1) Suddenly, out of the box, I get 4K/60Hz/4:4:4/RGB full range/8 bit (The Samsung TV is only an 8bit panel so no problem, and it looks great, quite vivid, I'm not wanting for more Bits so to speak)
2) No more random gray/black screens that require a reboot (this was really annoying because there was no way to recover, you just can't see what you were doing before)
3) My TV now STAYS on PC input mode, which is necessary for the settings mentioned above along with HDMI UHD color. With the AMD card it would change back every time the TV shut off.

So at this point, if you want a Samsung 4K/60Hz/4:4:4 TV (and quite possibly other brands) running from a computer, you need an NVidia graphics card. I couldn't even get 4K/60Hz/4:4:4 with limited RGB range out of my old RX 480. Like you, I spent days and tried everything. It sucks.

I replied to this earlier, but it seems to have disappeared...

For a Samsung TV and an AMD GPU to work properly at 4K 4:4:4, the refresh rate has to be forced to 60HZ, not the default of 59HZ. As soon as you force 60Hz, (and have HDMI renamed to PC, etc) 4:4:4 will work like magic. The menus change, new options appear, others disappear. I have verified this on an HD7970 using a Uptab DP to HDMI 2.0a converter and a Club3d DP to HDMI 2.0 adapter. On the RX 480 it works using HDMI direct to the card, but again, only at exactly 60Hz.

 

[JamieAlestorm]

For a Samsung TV and an AMD GPU to work properly at 4K 4:4:4, the refresh rate has to be forced to 60HZ, not the default of 59HZ. As soon as you force 60Hz, (and have HDMI renamed to PC, etc) 4:4:4 will work like magic. The menus change, new options appear, others disappear. I have verified this on an HD7970 using a Uptab DP to HDMI 2.0a converter and a Club3d DP to HDMI 2.0 adapter. On the RX 480 it works using HDMI direct to the card, but again, only at exactly 60Hz.

Have you tried overclocking this TV at all?

 

[ebayguy2006]

I think AMD finally got most if not all of their Sh1t together. Im now running an update on card, which is now 2nd to newest and it seems to work fine. I still have that issue with tv black screen and tv resetting. I think its the AMD card causing it though. I have to have the TV on before I turn pc on or I will most likely get lots of setting changes, which when it occurs, I say fk that, and switch power off. reboot.

This has been the worst computer updating issues ive experienced with tech in my entire 20 years on computers.
Even upgraded hard drive which was first faulty and upon reship, the 2nd one, my fault, but in a hurry to catch up on lost time with all this bs tech, i erased my old hard drives partition/mrb file.... what a headache in general newer stuff seems to be, or just my luck.

Im waiting for 1070's to drop into high $200's before I switch from AMD R9 390.

 

[Jure Slegel]

I was in the same boat. I was using VLC player which just doesnt play 4k videos, or I have yet to find any one who knows any settings that work. Spent days upon days searching and testing everything. VLC has been displaying in 4:2:0 on me even if I ignore the jutter and such. There is a 4k image online that test if your in 4:4:4.

Selecting input one, than hitting either up or down, or holding the select button yeilds more options, select PC. unfortunately you lose options like game mode, UHD, high dynamic, and MORE!

Also you can only yeild 444 in 8bit.

So my question is what is better, 4:2:2 or lower with higher bit? and other options on tv become available like UHD & dynamic?

I asked this question all over the place and forgot to update this thread... The issue was my AMD card. Full stop.

I got a GTX 1060, and it fixed every issue I was having.

1) Suddenly, out of the box, I get 4K/60Hz/4:4:4/RGB full range/8 bit (The Samsung TV is only an 8bit panel so no problem, and it looks great, quite vivid, I'm not wanting for more Bits so to speak)
2) No more random gray/black screens that require a reboot (this was really annoying because there was no way to recover, you just can't see what you were doing before)
3) My TV now STAYS on PC input mode, which is necessary for the settings mentioned above along with HDMI UHD color. With the AMD card it would change back every time the TV shut off.

So at this point, if you want a Samsung 4K/60Hz/4:4:4 TV (and quite possibly other brands) running from a computer, you need an NVidia graphics card. I couldn't even get 4K/60Hz/4:4:4 with limited RGB range out of my old RX 480. Like you, I spent days and tried everything. It sucks.

I replied to this earlier, but it seems to have disappeared...

For a Samsung TV and an AMD GPU to work properly at 4K 4:4:4, the refresh rate has to be forced to 60HZ, not the default of 59HZ. As soon as you force 60Hz, (and have HDMI renamed to PC, etc) 4:4:4 will work like magic. The menus change, new options appear, others disappear. I have verified this on an HD7970 using a Uptab DP to HDMI 2.0a converter and a Club3d DP to HDMI 2.0 adapter. On the RX 480 it works using HDMI direct to the card, but again, only at exactly 60Hz.

I have samsung ku6000 and i can get 4k 60hz full rgb 4:4:4 8bit no problem or YCbCr 4:2:2 12bit my gpu is amd 460.
But if i change my refresh rate to 59hz then i can get 4k 59hz full rgb 4:4:4 12bit. How can i check if this is actualy true or just my amd catalyst controll panel is crazy.

 

[ebayguy2006]

No matter what I do, I can only get 8bit.