Originally Posted by TeaBrain
The 90 degree turns are not an issue as regards feeding cable, as the trunking is surface mounted (not in wall) with a pop off cover, basically it's just a matter of laying the cable in place in the open trunking, bending it round in the corners, then when all in place pop the covers back on. So basically the concern was about the cable itself being bent at 90 degrees.
Ahh, as to how many I want, I was just hoping they had tiers....slim hope of course. Also, the Ruipro cable listings on Amazon UK state these are HDMI 2.0b 18Gbs capable, no mention of them being HDMI 2.1 capable. So given I will want to utilise HDMI 2.1 as soon as NVidia/AMD GPUs are released that can do that, spending £130 on a cable that perhaps isn't ready for that, which I might have to upgrade relatively soon, is a bit steep ! I would rather invest in a cable that is 2.1 guaranteed or a cheaper cable in the interim...
With regards to the 90 degree bending, you still need to make sure that the bend is as gentle as is possible. Nothing sharp. You will definitely have more flexibility with the Ruipro cables but still keep away from a sharp bend.
No one is mfr'ing a cable that has been validated for HDMI 2.1 feature sets, yet. Regardless of what the cable mfrs's marketing claims are. One of the main reasons is that there are still no consumer devices that can utilize all of the HDMI 2.1 features sets that require that bandwidth, so testing and validating is difficult to do. It's easy to put some sort of pattern generator on either end of a cable and say it's 48Gbps, but it's another thing entirely to prove that the cable can successfully and reliably transmit data that requires 48Gbps without errors. Besides, your source and sink devices have to have the same HDMI 2.1 chipsets in them otherwise backwards compatibility will occur, which basically means you will only be capable of HDMI 2.0 features because that's the in-common protocols. Either your source or sink will limit what it can do to HDMI 2.0, 18Gbps.
HDMI.org does not allow for active cables to be certified like they do for passive cables up to 25'. Hybrid fiber cables are active. Hopefully that will change but until if, and when it does, your best bet will be to use a cable from a mfr that has shown that their cables will work with HDMI 2.1 once source material and devices are widely available.
Ruipro will be releasing their Ruipro8k hybrid fiber cables in the next couple of months. Even though the cables will not be certified (QR label) like the Premium High Speed HDMI cables are, they are tested and validated by an ATC using HDMI.org approved testing devices and protocols. That being said, no cable mfr will offer a 100% guarantee that their cables will work reliably for any given setup or cable distance for HDMI 2.0 and definitely not HDMI 2.1. There are just too many variables involved besides the data pipe.
Using a conduit similar to your setup is the best thing you can do because it affords easy and safe access. Realistically you will more than likely be swapping out cables, especially if your ultimate goal is to utilize all of what HDMI 2.1 has to offer, unless you wait for validated HDMI 2.1 devices to be in consumer's hands and the various cables are put into use.
You can go cheap and hope for the best but your chances are much better for success (reliability = longevity) with a better made cable from a mfr with a known reputation for high quality cables. Distance is going to be your enemy.
I would go with a well made cable that has been shown to work well at your distance for HDMI 2.0 protocols. Then wait for HDMI 2.1 compatible devices and see what happens, updating your cable to one that has been tested for HDMI 2.1 feature sets at that time (Ruipro8k). The LG C9 offers HDMI 2.1 but it is still unclear if that is just eARC and VRR (which is possible with the HDMI 2.0 chips) or if the chip sets that LG are using (proprietary and modified chips) are capable of being upgraded to more, if not all, of the HDMI 2.1 features. Keep in mind that ARC/eARC may have issues at those distances as it does now. Only time will tell.