tl;dr Canon will choose to support various standards when reasonably priced chipsets are available. They will not choose bleeding edge (expensive chipsets) technology when not essential.It seems English canon rumors have not talked about it.
R1 will support CFexpress type b 4.0. The camera has 3000MB/s writing speed.
This news is from Taiwan memory card company which is ready to sell CFexpress type b 4.0. So R1 bandwidth is large enough ro over 120fps.
I hope R5ii will support this also.
CFe 2.0 was released in 1Q19... 5 quarters before R5 released ie sufficient time for chipset manufacturers to have reasonable priced chips/cards/capacity.
=> Canon needed the bandwidth of CFe B cards (vs SD UHSii or CF Flash) to support internal 8k30 raw recording (including R5C 8k60 recording)
=> If my calculations are correct, R5 buffer clearance speed is currently under 1GB/s for 12fps/14bit compared to CFe sustained write speeds at ~1.4GB/s. The processor is the limitation not the card.
https://www.the-digital-picture.com...-R6-Buffer-Capacity-During-High-Speed-Capture
CFe 4 released 3Q23... 3 quarters before R5ii release. Card slot dimensions are the same so it is the chipset/processor bus that is the difference
CFE 4 cards only needed IF the R5ii sensor resolution was increased, 14 bit @ 20fps and wanted the ability to have unlimited buffer. 1D/R3/R1 only have had unlimited buffers in the past.
"CFexpress 4.0 is designed to maintain certain power consumption targets to help improve the adoption" but the max current for type B is 3A which is higher than CFe 2.
Thermal hotspot is a significant issue for the R5 and any future hybrid body.
=> If heat generation is better and higher write speed needed then CFe 4 support is worthwhile.
Canon chose not to use the HDMI 2.1 chipset (released 2017) limiting the external recording speed ie no 8k30 raw or 4k120 external recording. Why is a good question!
If the Ninja V+ 8k prores raw was available at release and/or real internal temperature measurements were used or if higher internal temperatures were allowed or RAW light recording options at the beginning then => no overheating issues.
For comparison....
Sony choose CFe Type A card specs in A1 (and others) due to:
- Sony also makes the memory cards (a la Memory Stick in the past)
- Combining SD UHSii cards and CFe Type A card slots was possible and fits into their form factor
- Fast SD UHS-II cards can record the A1's fastest video speeds.
- The CFe A cards would only clear the buffer faster for stills => very few users needed to use CFe A cards... plus they are much more expensive and lower capacity than CFe B cards
- Heat generation of the card usage is lower and Sony allowed higher internal temperature to avoid the dreaded 'overheating' debarcle
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