Yes, the Lexar Professional 2000x 256GB SD is compatible with the Sony Alpha A9 III.
Sony A9 III accepts SD UHS-II in both slots. Lexar 2000x 256GB writes at 260 MB/s (V90), meeting V90 requirement for all SD-compatible recording modes including XAVC S-I 4K (600Mbps) and S&Q Motion XAVC HS/S 4K (up to 560Mbps).
“This camera supports CFexpress Type A memory cards and SD memory cards (UHS-I, UHS-II compatible).”
Last verified:
Confidence: inferred