Yes, the Canon EOS R5 Mark II works with the Lexar Professional 2000x 256GB SD — but only 4K30 via SD slot supported. 4K60 and above requires CFexpress.
Lexar 2000x writes at 260 MB/s. Canon R5 Mark II SD slot supports 4K30 at lower bitrates -- 260 MB/s meets that SD mode floor. 4K60+ requires CFexpress Type B.
Conditions for compatibility
4K30 via SD slot supported. 4K60 and above requires CFexpress Type B in primary slot.
“CFexpress cards Type-B compatible SD/SDHC/SDXC memory cards UHS-II”
Last verified:
Confidence: inferred