Yes, the Lexar Professional 1667x 64GB SD works with the Sony Alpha 1 — with conditions (see below).
Lexar Professional 1667x 64GB SD is V60 class. Clears: XAVC S HD (100 Mbps, requires U3); XAVC HS 4K (280 Mbps, requires V60); XAVC S 4K (280 Mbps, requires V60). Does not meet the floor for: XAVC HS 8K (520 Mbps, requires V90); XAVC S-I 4K (600 Mbps, requires V90); XAVC S-I HD (222 Mbps, requires V90).
Conditions for compatibility
Compatible with XAVC S 4K/HD and XAVC HS 4K at standard bitrates (V60 sufficient). Incompatible with XAVC HS 8K (520Mbps, requires V90) and XAVC S-I 4K (600Mbps, requires V90). Not recommended for highest-bitrate A1 video workflows.
“XAVC HS 8K 520Mbps *1 CFexpress Type A memory card (VPG200 or higher) SDXC V90 or higher *2”
Last verified:
Compatibility inferred from spec rule (citations above are manufacturer-verified)