Yes, the Canon EOS R50 is compatible with the Lexar Professional 1667x 64GB SD.
Lexar 1667x UHS-II writes at 120 MB/s. Canon R50 4K30 minimum is 60 MB/s. 120 MB/s passes with margin.
“Canon EOS R50 Compatible Cards: SD/SDHC/SDXC memory cards — UHS-I cards supported; UHS-II cards operate in backward-compatible UHS-I mode per Canon online manual.”
Last verified:
Confidence: inferred