4k HDMI cables.

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richms

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#171855 3-May-2015 12:09

So I bought a "4K" HDMI cable.

Turns out they meant just at 30Hz, so its useless between PC and TV. At 60Hz it just glitches and drops in and out all the time.

Seems I need a HDMI 2.0 cable. Anyone found a 10m one that isnt absurdly expensive available in NZ at all?

Richard rich.ms

hooplish

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#1296237 3-May-2015 19:10

You'd need a GPU that supports 4K at 60Hz to get 4K at 60Hz. (Unless you own a GTX 970/980, if so disregard my previous statement)

billgates

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#1296244 3-May-2015 19:28

There is no such thing as 4K HDMI cable or HDMI 2.0 cable. HDMI cable is just a dumb pipe. Your equipment needs to be 4K or HDMI 2.0 spec capable

Edit - Buy the 10m HDMI cable from RapalloAV that is or the Redmere cable from monoprice.

http://www.rapalloav.co.nz/12m-advanced-high-speed-hdmi-cable.html

Do whatever you want to do man.

richms

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#1296247 3-May-2015 19:37

hooplish: You'd need a GPU that supports 4K at 60Hz to get 4K at 60Hz. (Unless you own a GTX 970/980, if so disregard my previous statement)

I have a 970, and the TV also takes HDMI 2.0 for 50/60Hz, its just that when I set it to 60Hz its a mess of glitches and dropouts, a 3m one going across the room works fine, but it was hanging in midair between the TV and the computer so not a workable solution. Looking at the excess cable length a 7.5 might just reach if I move the tower to the other end of the desk so I may get a 7.5m tomorrow and try that.

Richard rich.ms

Dunnersfella

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#1296259 3-May-2015 20:09

Look for a rateable speed that the manufacturer / retailer will stand behind at 8-10 meters.
18GB per second should be able to be achieved day in, day out.

Let us know what you find, typically I'd suggest an HDBaseT solution, but if you don't have budget, then fair enough.

LennonNZ

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#1296262 3-May-2015 20:16

richms: So I bought a "4K" HDMI cable.

Turns out they meant just at 30Hz, so its useless between PC and TV. At 60Hz it just glitches and drops in and out all the time.

Seems I need a HDMI 2.0 cable. Anyone found a 10m one that isnt absurdly expensive available in NZ at all?

There isn't such a thing as a HDMI 2.0 Cable. The Specs didn't change in Cables when HDMI2.0/4K Came out. A High Speed HDMI Cable will work 100% fine.
If the Cable doesn't work take back and claim under the CGA that the Cable doesn't work.

http://www.hdmi.org/manufacturer/hdmi_2_0/

"HDMI 2.0 does not define new cables or new connectors. Current High Speed cables (Category 2 cables) are capable of carrying the increased bandwidth."

Talkiet

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#1296306 3-May-2015 21:52

With that amount of data and long cables though, you're simply running into the limit of how long the cable can be before the signal loss (or noise increase - whatever) causes the issues you're seeing.

The fact a 3M cable works is proof of this. While you can't get a HDMI 2.0 spec cable, you CAN get better cables - thicker wires etc. They _do_ help. I have 3 long HDMI/DVI-D runs in my house (10Metres) and the first couple of cheap cables I got wouldn't work at 2560*1600. When I stopped being a cheap-ass and bought good cables (Not Monster - just nice thick ones) all the problems went away.

Cheers - N

Please note all comments are from my own brain and don't necessarily represent the position or opinions of my employer, previous employers, colleagues, friends or pets.

macuser

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#1376047 29-Aug-2015 11:24

Can any of you point to a quality cable capable of doing 4K60 4:4:4? I have a high speed cable but it's not thick enough I don't think, need one with better sheilding. Looking for around 3M long.

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richms

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#1376048 29-Aug-2015 11:29

I bought these since they specifically listed the bitrate needed etc. Works from GTX970 to LG 4k TV but I am not certain if it is 444 or not. Not in use at the moment because I am too lazy to climb into the roofspace to put it thru and it was a pain across the floor.

http://www.amazon.com/gp/product/B00SI1JD56

Richard rich.ms

Masterpiece

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#1377386 31-Aug-2015 21:20

HDMI spec for 2.0(a) defines a few parameters to keep in mind.

2160p @ 24/25/30hz
8bit => RGB/4:4:4
10bit => RGB/4:4:4
12bit => RGB/4:4:4 & 4:2:2
16bit => RGB/4:4:4

2160p @ 50/60hz
8bit => RGB/4:4:4 & 4:2:0
10bit => 4:2:0
12bit => 4:2:2 & 4:2:0
16bit => 4:2:0

Because a display says HDMI now it does not actually have to say 2.0, also it only has to have some of the defined specs to say that's it is HDMI 2.0

Some displays point to 1 specific HDMI port to plug UHD signals into, as the other ports could be HDMI 1.4

What I am pointing too, you are probably not over driving the cable, more likely the display or output or both. If you want 2160p 4:4:4 or RGB you should stick to 24hz, let the display up the hz

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macuser

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#1377446 31-Aug-2015 22:36

I think 18Gbps cables should take care of any current 4K display needs, up to 4K60 4:4:4

jeeg

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#1380467 6-Sep-2015 01:54

macuser: Can any of you point to a quality cable capable of doing 4K60 4:4:4? I have a high speed cable but it's not thick enough I don't think, need one with better sheilding. Looking for around 3M long.

I use the cable supplied by Xbox One although it is only about 1M long. It does 4K60 4:4:4 no problem.

Dunnersfella

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#1380492 6-Sep-2015 09:15

Short runs shouldn't be an issue, longer 4m +, that's another story...

geezagillard

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#1400429 5-Oct-2015 16:56

The Company I work for supplies HDMI leads into JARussell under the 'Prolink' brand and we have had a few discussions around HDMI 2.0. Whilst we have tested our LDPL414 HDMI cables out to 25m with 4K @ 30HZ we cannot say what the performance would be at 60HZ simply because we are unable to generate the test signal.

The HDMI 1.3/1.4 spec is 10 Gbps and this should happily cover 4k at 30Hz (although many cables fail at the longer lengths despite the claims)....its the jump to 60Hz that leads to the need for HDMI 2.0 or 18Gbps. It is simply a guess at this stage to say how far the existing cables would be happy with a 4k 60Hz signal. The manufacturers wont commit to anything over 5m and I imagine a lot of work is going on in the background at the moment to establish an HDMI 2.0 certified cable into the market at a reasonable price and at an 'installation' length.

macuser

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#1400430 5-Oct-2015 16:57

geezagillard: The Company I work for supplies HDMI leads into JARussell under the 'Prolink' brand and we have had a few discussions around HDMI 2.0. Whilst we have tested our LDPL414 HDMI cables out to 25m with 4K @ 30HZ we cannot say what the performance would be at 60HZ simply because we are unable to generate the test signal.

The HDMI 1.3/1.4 spec is 10 Gbps and this should happily cover 4k at 30Hz (although many cables fail at the longer lengths despite the claims)....its the jump to 60Hz that leads to the need for HDMI 2.0 or 18Gbps. It is simply a guess at this stage to say how far the existing cables would be happy with a 4k 60Hz signal. The manufacturers wont commit to anything over 5m and I imagine a lot of work is going on in the background at the moment to establish an HDMI 2.0 certified cable into the market at a reasonable price and at an 'installation' length.

Get a GTX 950, it can output 4K60 4:4:4 and RGB