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post #1 of 11 Old 10-27-2017, 11:33 AM - Thread Starter
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4K@30Hz vs 4K@60Hz?

I didn't know where to post this so this seemed like the best place as anyone here must surely know the answer. What is the difference to my eye of these two? Lack of HDR? I'm sure this question is elementary but its a little over my head. Does the 30 vs 60 mean number of times screen is refreshed. How does it compare to frames per second? Very confusing to my mind.

I'm trying to buy a 1x2 HDMI splitter on Monoprice and they all say that they support up to 10mbps and 4K@30HZ. Same at Amazon. Why can't they support 4K@60Hz? All the certified high speed cables do. If I use one of these splitters, they cost between $17 and $35, will my picture be degraded or am I just giving up HDR?

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post #2 of 11 Old 10-27-2017, 01:34 PM
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A splitter that says it's only capable of 10.2 Gbps means it is HDMI 1.4. For 4k HDR, you need one that is 18 Gbps HDMI 2.0a with HDCP 2.2. Otherwise, you will only get 1080p SDR. The only 1x2 splitter I see at Monoprice is this one. Here's a cheaper one from Sewell.

But know that if you use a splitter, both displays on the other end must be HDMI 2.0a HDCP 2.2 compliant. This doesn't work for people with Xboxes trying to send HDR to their display while sending lossless audio to an older receiver. If the receiver doesn't have HDMI 2.0a with HDCP 2.2 ports, then the entire signal for both outputs gets scaled down to 1080p SDR. That's just how HDCP works.
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post #3 of 11 Old 10-27-2017, 06:03 PM - Thread Starter
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Thank you for the splitter info. Can you tell me what is the practical difference between 4K@30Hz vs 4K@60Hz?

Jack

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post #4 of 11 Old 11-01-2017, 11:45 AM
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Quote:
Originally Posted by JackB View Post
Thank you for the splitter info. Can you tell me what is the practical difference between 4K@30Hz vs 4K@60Hz?
The practical difference is that 4k@60hz can support sources up to 60 frames per second, such as a video game, or potentially a 60fps 4k broadcast like sports or racing.

The unmentioned difference is that 4k@30hz limitation implies HDMI 1.4, so no HDR or other new HDMI 2.0/2.1 features.
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post #5 of 11 Old 11-01-2017, 01:47 PM
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This may answer your question.... The last part of the video gives you a real idea of the difference.
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post #6 of 11 Old 04-15-2018, 11:53 AM
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I dug this thread up, because I have a question about this. I was eying a projector that seems to only support 30hz 4k HDR content. (The epson 7300, I'm not sure about the US name)
So, as far as I understand it means that it does not support games that run with 60fps? So, does this mean a game that runs with 30fps will be shown in 4K HDR? (For example the cinematic mode of the new Shadow Of The Colossus remake)
I'm also not sure about Netflix 4K content. Can you somehow choose if Netflix outputs at 30hz or 60hz, maybe in the app options or so? So that I can watch TV shows in 4K HDR? Because I saw people talk about this, and some said that you cannot watch Netflix 4K HDR with the Epson 7300 and others say you can. I'm really confused about this.

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post #7 of 11 Old 04-15-2018, 04:26 PM
 
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Technically, in terms of bandwidth alone, HDMI 1.4 could handle 4K30 at 4:4:4 in 8-bit or 4K30 in 4:2:2 in 12-bit so that's more than enough for 4K24 or 4K30 HDR10.

PS4 original had HDMI 1.4 but is able to send HDR, you do not need the Pro to get it which has HDMI 2.0a outputs AFAIK.

http://www.digitaltrends.com/home-t...4-and-ps4-pro/
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post #8 of 11 Old 04-16-2018, 08:00 AM
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In many cases, I believe only HDMI 2.0 will allow "true" UHD signals without some chroma-subsampling limitations
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post #9 of 11 Old 12-27-2018, 01:13 PM
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Originally Posted by puddy77 View Post

But know that if you use a splitter, both displays on the other end must be HDMI 2.0a HDCP 2.2 compliant. This doesn't work for people with Xboxes trying to send HDR to their display while sending lossless audio to an older receiver. If the receiver doesn't have HDMI 2.0a with HDCP 2.2 ports, then the entire signal for both outputs gets scaled down to 1080p SDR. That's just how HDCP works.
So I am trying to get some info on the whole splitter issue as well. My setup is currently all 1080p. I recieved a 49" Roku TCL 4K for Christmas. I use a powered splitter to send signal to my projector and my current TV simultaneously. I purchased a powered splitter 4K @ 60Hz but I think it's only 10Gbps. I also purchased two 2.0 hdmi cables to go from my Onkyo TX-NR 838 to the splitter then to the display. My Onks monitor output is 2.2 compliant. My projector is only 1080p. So what you are saying is that since my projector is 1080p both signals will get scaled down to 1080p? Since this is a Roku TV I will be using an ARC input on the TV. I have always just connected source devices to the AVR but since this is a Roku TV I'm wondering if I enable the ARC on the TV if thats going to cause issues with my blu ray player or my fire tv that are currently connected to the AVR ( with regards to the audio from both devices)? Just trying to understand what might occur when I try to make these connections this weekend with the new TV.
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post #10 of 11 Old 12-27-2018, 01:59 PM
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Originally Posted by david0406 View Post
So I am trying to get some info on the whole splitter issue as well. My setup is currently all 1080p. I recieved a 49" Roku TCL 4K for Christmas. I use a powered splitter to send signal to my projector and my current TV simultaneously. I purchased a powered splitter 4K @ 60Hz but I think it's only 10Gbps. I also purchased two 2.0 hdmi cables to go from my Onkyo TX-NR 838 to the splitter then to the display. My Onks monitor output is 2.2 compliant. My projector is only 1080p. So what you are saying is that since my projector is 1080p both signals will get scaled down to 1080p? Since this is a Roku TV I will be using an ARC input on the TV. I have always just connected source devices to the AVR but since this is a Roku TV I'm wondering if I enable the ARC on the TV if thats going to cause issues with my blu ray player or my fire tv that are currently connected to the AVR ( with regards to the audio from both devices)? Just trying to understand what might occur when I try to make these connections this weekend with the new TV.
I may have just had my problem solved. I didn't know my AVR had 2 hdmi out. When I set my system up I only had a NR609 that only had 1 hdmi out so a splitter is how i handled the problem. My NR838 has 2. So the projector to zone 2 hdmi out and the 4K TV to the main hdmi out 2.2. I hope that works.
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post #11 of 11 Old 12-27-2018, 02:26 PM - Thread Starter
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Quote:
Originally Posted by david0406 View Post
I may have just had my problem solved. I didn't know my AVR had 2 hdmi out. When I set my system up I only had a NR609 that only had 1 hdmi out so a splitter is how i handled the problem. My NR838 has 2. So the projector to zone 2 hdmi out and the 4K TV to the main hdmi out 2.2. I hope that works.
Beware that sometimes the 2nd output has limitations on it and can be a headache to trace down any issues that arise. My 2015 Denon had some limitations that basically made having a 2nd 4K TV useless.
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Reply High Dynamic Range (HDR) & Wide Color Gamut (WCG)



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