Are differenct HDMI cables required for 4K HDTV?

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Old 04-09-15, 05:42 PM
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Are differenct HDMI cables required for 4K HDTV?

I am upgrading to 4K HDTV (specifically and LG 65UF8500). The salesperson indicated that a new type of HDMI cable would be needed to transmit the 4K resolution. Is that correct? If so, what is the new specification. I looked at several cable websites and most of their "Hi speed" HDMI cables specified they would support 4K transmission. The specifications on the TV do not indicated any new type of cable is required.
 
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Old 04-09-15, 05:55 PM
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Any decent hi speed cable will work fine for you. A dedicated 4K cable is nonsense.

If you already have a cable...... try it. The picture will either work 100% or you may see drop out which would mean try a different cable. The picture won't be any sharper or clearer with a "better" cable.
 
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Old 04-10-15, 07:51 AM
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It is possible that some older HDMI cables would not transmit signals at the rate needed to support 4K or UHDTV.

This would be a case by case situation. There is no easy to find out other than magazine reviews or published test results or word of mouth of your actual trying out of a particular cable.

UHDTV and 4K have a much higher data rate requiring a cable with more bandwidth.
 
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Old 04-10-15, 11:19 AM
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Thanks for your information and comments. If the HDMI cable has an indicator or label that says 'Hi Speed" would that indicate it has the required bandwidth?
 
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Old 04-10-15, 06:37 PM
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The labeling "Hi Speed" is just like "new and improved". These are words that can be thrown in for the wow factor.

If it's a name brand cable it should be fine. You won't hurt anything by trying it.
 
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Old 04-10-15, 06:56 PM
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An HDMI cable supporting the 1.4 standard is certified for 4k throughput. Other cables may work but the signal likely will be degraded.
 
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Old 04-12-15, 04:17 AM
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For 4k at 60Hz you need an HDMI 2.0 cable. Version 1.4 supports resolutions up to 4k/24Hz.

That said, any cable you have is almost certainly 1.4 (anything after 2009) and it will probably work.
 
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Old 04-17-15, 08:24 AM
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There is still open discussion about incorporating 10 bit color into 4K formats. The current HDTV format uses 8 bit color.

You will need the HDMI 2.0 cables and supporting electronics to handle 4K with 10 bit color.

Digital video uses the three component comparable to the Y, Pb and Pr signals in analog component. In digital form the signals are called Y, Cb, and Cr. (oversimplified description follows) Each signal has one 8 bit byte per pixel+ allowing about 240* gradations which for Cr is about 120 gradations towards red and 120 gradations towards cyan. The 10 bit color allows 480 gradations of each of the latter respectively giving some additional smoothness of color.

* Eight bits represent 256 possible values but a few are reserved for other purposes besides the different gradations of color or luminance.

+ Customary compression in digital video means that not every transmitted or stored frame contains all 1920x1080 or 720x480 or whatever pixels.
 
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