so to make this clear in my head for inputs, like the RX-V6A (after fix etc) it will have 3 inputs for HDMI 2.1 and the rest will be HDMI 2.0 ? at the lower speeds
Current accurate answer to your question for 2020 models is -
Yes, but...
According to current spec, three upgraded HDMI 2.1 ports would be 24 Gbps each, not 40 Gbps. Here is why. Yamaha's website reads "4K120 AB*, 8K60 B*". This can minimally work with 24 Gbps (10-bit 4-2-0). Below is the bandwidth chart for compressed (B) and uncompressed speeds (A). 8K60 B means port speed of 24 Gbps, as this works with DSC. 4K120 AB has six bandwidth flavours, ranging from 18 Gbps to 48 Gbps. Those depend on chroma colours and bit depth. So, if 8K60 B cannot do more than 24 Gbps, then 4K120 flavour will also be limited to 24 Gbps or 10-bit 4-2-0. Such port cannot push through 4K120 10-bit RGB (40 Gbps). If it could, they would have had to advertise 8K60 with
AB. For 8K60 AB 10-bit, one minimally needs 40 Gbps, almost twice as wide bandwidth.
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It's not clear whether board change would bring new chips with 40 Gbps capability or new chips with 24 Gbps for those three ports. HDMI 2.1 port speeds span from above 18 Gbps all the way up to 48 Gbps.
Not all HDMI 2.1 ports are the same (see opening post for speeds of current sources). It'd be most useful if Yamaha could clarify this finally. It should be really simple to communicate this to the public. Has anyone seen any specific publication about the speed, which new boards would arrive with? I truly hope they replace boards with three 40 Gbps ports, so this could work properly with consoles and GPUs. Otherwise, the board upgrade would be stupid.
Answer for 2021 models - it's a bit confusing after seeing Crutchfield's listing. They might wrong by done copy&paste. And they might be right too. Yamaha's website reads that new receivers supports 4K120 AB and, most importantly, 8K60
AB 10-bit, which is 40 Gbps. There are 7+3 ports. But they do not currently explicitly say that all ports would be 40 Gbps. It's just that Yamaha is not specific about it, unless I have missed something.
If we split A and B signals into two bandwidth groups, it is also possible for new models to get two different chips on boards, like in announcement for Onkyo/Pioneer (link in OP). Both chips are HDMI 2.1, but one is much faster.
1. "Speedy chip" for AB signals (3-in-1-out)
4K120 A for 10-bit RGB requires 40 Gbps (they say 10G/4L - 10 Gbps per lane x4)
8K60 A for 10-bit 4-2-0 requires 40 Gbps (they say 10G/4L - 10 Gbps per lane x4)
2. "Slower chip" for AB signals up to 24 Gbps (4-in-2-out)
4K120 A for 10-bit 4-2-0 requires 24 Gbps, 4K120 B for 10-bit RGB needs 18 Gbps only, so fits in
8K60 B for 8/12-bit RGB requires 24 Gbps
That's 10 ports, with the second set on ports running on a slower chip, like Onkyo. It's also a fair solution. There is nothing wrong with it, but we need to be aware of this, whether it is the case or not.