Cannot find anything in the camera manual about support for CFexpress card support for PCIe 4.0 x2 Bus.
Can anyone confirm that the R5 Mark 2 supports CFexpress cards PCIe 4.0 x2 Bus
Per ChatGPT:
"Short answer: No — the R5 Mark II uses CFexpress Type B (CFexpress 2.0), not a PCIe 4.0 x2 interface. That means PCIe-4.0 CFexpress cards will work (backwards-compatible) but will only run at the camera’s CFexpress-2.0 speeds.
Quick details and evidence
Canon’s official specs/manual list Card 1 = CFexpress Type B (CFexpress 2.0) and call out VPG-400 support — Canon does not advertise a PCIe-4.0 x2 interface for the camera.
CFexpress 4.0 (PCIe-4.0) cards are backwards compatible, so they’ll physically fit and be usable in the R5 Mark II, but they won’t deliver PCIe-4.0 throughput in-camera — you’ll be limited to the camera’s CFexpress-2.0 interface. Community tests and discussions reach the same practical conclusion.
Practical implication: buying a CFexpress 4.0 card can be useful (faster offload with a 4.0 reader, future-proofing), but it won’t give you higher in-camera write speeds or larger real-time recording headroom than a 2.0 card unless Canon releases a firmware/hardware change (which Canon hasn’t announced). Check Canon firmware notes if you care about incremental compatibility updates."
