Yes, the Lexar Professional 1667x 64GB SD is compatible with the Panasonic Lumix S5 IIX.
Lexar 1667x writes at 120 MB/s. Panasonic S5 IIX 4K60 All-I minimum is 90 MB/s (Video Speed Class V90), not 200 -- corrected 2026-06-21 after a class-label/bitrate-tier mistranslation bug. 120 MB/s clears the real requirement by 30 MB/s.
“Compatible with UHS-I/UHS-II UHS Speed Class 3 standard SDHC/SDXC Memory Cards”
Last verified:
Confidence: inferred