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Then I'll spend 300 quid on a 4k telly
Lord knows how they're going to get it down wires.
Nil Satis Nisi Optimum
Note, better doesn't mean a nicer colour or has a wooden bit on it.
It's a digital communication, not analogue.
Like hdmi - do you know what version we are up to now?
Basically, as our needs evolve (lol "needs") technology needs to keep up. I've been looking at motherboards with the latest USB and hdmi format, both of which are capable of transferring more data faster - which is important if you're effectively streaming 24 8mp photos every second along with sound and other information along with it.
Computers are only just keeping up - not many people game at 4k.
Original HDMI cables came as standard or high speed; this denoted the bandwidth they could sustain at a bit error rate of 10^-9 - the maximum permissible in the HDMI specification. The theory was that standard cables were good for 720p (which has a data rate of 2.23Gbps), and high speed cables were good for 1080p60 (which has, unsurprisingly I hope, a data rate of 4.46Gbps), though in practice it was possible to build a 1080p60 capable cable that only met the standard specification.
Still with me? Good.
As any fule kno, 4k/UHD requires a LOT more bandwidth than HD. UHD60 with 4:2:0 subsampling and 10-bit colour knocks in at 11.14Gbps. That, clearly, will not go through a cable that can only support 2.23Gbps. Full-fat 4k - 4096x2160 at 60 frames per second, no subsampling and 12-bit colour, needs a whopping 26.73Gbps.
To give you a rough idea, you can meet the standard cable spec with 28AWG conductors and an overall foil shield. A current spec High Speed cable needs 24AWG conductors as a minimum, interleaved shielding, careful dielectric selection and so on.
Let's be clear though; even a boggo HDMI 1.0 standard speed cable is carrying somewhere around 10,000 times the bandwidth needed for an analogue audio interconnect. Five orders of magnitude. For comparison that's about the same as the difference between the height of a table and where a jumbo jet flies.
I know you're just trolling, but I would dearly like to think you're willing to open your mind and read some of this - maybe even try to understand it, and to understand why different cables have different requirements, and that these requirements are all very, very well understood by the engineering profession.
Not so sure on that one. I've seen some test material; 48fps looks sharper, certainly, but to me (and I'm not alone in this) it doesn't look 'right' for films. Partly that's down to what we're used to, but if you see the relatively raw camera output at higher frame rates it looks like telly, not like cinema.
Nil Satis Nisi Optimum
From HD ready to full HD is double the pixels and double the bandwidth.
From full HD to 4kUHD is four times the bandwidth (gross simplification).
The bandwidth for HD ready is 10,000 times higher than the bandwidth of analogue audio. Analogue audio might as well be DC by comparison.
Try this - http://www.extron.com/download/dltrack.aspx?file=Digital_Design_Guide_3rd_edtn_RevE.pdf&id=78184
My employer does some very good ones, but a 3.6m one is about £75 inc VAT. In a commercial installation it makes sense (a revisit to replace a dodgy cable will cost far more than that), but for home use it's probably/definitely over the top.
I'd suggest just buying something that's rated HDMI2.0 High Speed. For example (I've not used one as I get all my HDMI cables as part of a demo pool) this, based on the specs and my experience with other cable types in the range, should do nicely for £5.49 for 3m:
https://www.amazon.co.uk/gp/product/B014I8T0YQ/ref=amb_link_209467027_9?pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=hero-quick-promo&pf_rd_r=W0SMAEQH532M2WNSTW9V&pf_rd_t=201&pf_rd_p=866904207&pf_rd_i=B003L1ZYYM
Certainly don't spend silly money on any cable that claims better performance (such as deeper blacks, more vibrant colours, blah blah). To be sold as HDMI2.0 and High Speed it must meet the performance standard. Exceeding the standard has no benefit.