Yes, the Lexar Professional 1667x 64GB SD is compatible with the Nikon Z fc.
Lexar Professional 1667x 64GB SD is V60 class. Meets the floor for: 4K30 (30 MB/s floor). (Peak write 120 MB/s is not evidence of sustained performance; the V60 class rating above decides this.)
“Nikon Z fc specifications: storage media is SD and UHS-I compliant SDHC and SDXC memory cards — UHS-II cards operate in backward-compatible UHS-I mode.”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)