EVGATech_MDecker
Hello,
 
per the review you linked did you already follow this step?
 
"Like the Sony X750D, the X700D can display Chroma 4:4:4 at 4k @ 60Hz only on the HDMI port 2 and 3 and you need to switch the 'HDMI signal format' to 'Enhanced format'. When the picture mode is set to 'Graphics' or 'Game' the input lag is 31.4ms."

AlexBW
According to this review Sony X700D TV REVIEW XBR55X700D supports chroma 4:4:4 @60Hz both at 1080p and 4K.
 
I have XBR55X700D directly plugged into my gaming computer. I upgraded my graphics card to GTX 1080 Ti yesterday. GTX 1080 Ti supports DP 1.4, HDMI 2.0b and HDCP 2.2. I am using a high speed Monster HDMI cable to connect the two.
 
nVidia control panel only displays 8bit YcbCr422 if I select 3840x2160 @60Hz. The only way I can get YcbCr444 is by selecting refresh rate 30Hz which results in dimmed display with a bit of flickering and doesn't look good when I am playing PC games. Apparently HDR works only @30Hz with YcbCr444.
 
I would really like to run my setup @60Hz 4K YcbCr444 with HDR enabled. How do I make it work ?
 
Any help will be greatly appreciated.

AlexBW
Ah, sorry, thought you were asking about the TV options.
 
On my PC under Ultra HD, HD, SD - highest resolutions are
4k x 2k, 4096 x 2160
4k x 2k, 3840 x 2160 (Native)
 
Under PC:
1680 x 1050
 
I have 4k x 2k, 3840 x 2160 (Native) selected.

AlexBW
As per the review I linked and yet another article I came across (can't seem to find that now), my TV does support what you said can't be achieved. As per the review I linked -
        4k @ 60Hz @ 4:4:4 + 8 bit HDR : 32.4 ms

1. 
2. HOME button > Settings > External Inputs > HDMI Signal format
3. 
4. 
5.  
   Note: You might want to use Limited Range RGB or YCbCr444 as some Sony displays have color banding issues with full range.  Test Pattern (to check with) here: http://i.imgur.com/zYtLsRR.png
   

AlexBW
OK, RGB Full has no issues. Any ideas why YcbCr444 results in green screen upon reboot ?

AlexBW

Quad5Ny
Well I was wrong about it not being the cable.
 
I am curious though, the cable itself shouldn't block you from selecting a resolution or color depth.  If it wasn't able to handle the pixel clock you would just get a blank screen or various degrees of 'sparkles' on the screen.

I used to think the same way,  a cable is a cable after all !  Apparently the cable couldn't handle the bandwidth for 4K chroma 444 @60p as that would require >= 18Gbps.
 

Quad5Ny
As for the YCbCr444 green screen, not sure about that one.  You're using a TV so it should support it.  It doesn't really matter though as RGB Limited has the exact same picture quality as YCbCr444 (if you wanted to use that instead of RGB Full).

 

arestavo
 
A green screen is typically an issue with the card not outputting the proper settings (something to due with clock timing). I had green screen problems back with my Sony X810C when I was messing with getting 1080P at 120Hz working.
 
Honestly, RGB full is the BEST picture quality that you can get on a TV currently until Display Port on TVs becomes a thing. Personally, I can't see why anyone would want to run Chroma even at 4:4:4 over RGB.

I have set it to RGB Limited and so far no issues. The green screen issue arises only with chroma444 @60p. Surprisingly I am able to see the UEFI boot logo and Windows spinning wheel animation at startup, only when it loads desktop screen turns green. If I blindly log out and log back in the green screen goes away, the desktop loads and things are normal until I reboot. So, I am not sure if it is related to clock timing. May be the graphics driver is crashing which results in green screen, the graphics driver resets but the display is not reset until I log off and re-login. Well, I am not sure where to look, I am more of a linux guy.

AlexBW

HeavyHemi
Also, you should be running full and not limited. You may have to to adjust the HDMI black level. I was suspecting it was your cable. Monster...I only use their speaker cables. I have  couple of sets from the 80's they are 15' and weigh a couple of pounds...fine strand twisted copper...thick as jumper cables... ha.  Here's a decent site to calibrate your set: http://www.lagom.nl/lcd-test/

It is my understanding that Full should be used only with LCD monitors while Limited should be used with TVs as TVs are not capable of displaying full range, unless I got that wrong.
 
Thanks for the link. I was already following this to calibrate my TV - https://lifehacker.com/5858625/how-to-calibrate-your-hdtv-and-boost-your-video-quality-in-30-minutes-or-less but, I would take a look into the one you linked.

Syed117
The HDMI cable absolutely matters.
 
This entire saga is very well documented on random forums, including this thread on AVS:
 
http://www.avsforum.com/forum/168-hdmi-q-one-connector-world/2016401-hdmi-cables-support-4k-60hz-4-4-4-chroma-deep-color-59.html
 
Not every cable, not even every high speed cable will work. It's really hit or miss and the length of the cables also comes into play. The longer the length, the more chances of cables not working.
 
I tried 3-4 different cables from Amazon around 20 feet and the only one that worked for me (Samsung KS8000 series) was the monoprice premium series. The passive one.
 
Have had no issues with it over the last few months.