Lexar Professional 1667x SD Memory Card, UHS-II, 64GB–256GB

UHS-II adds a second row of contacts, but the rated read speed only appears when both the camera and the reader are UHS-II. In a UHS-I body the card works and falls back, which is where most of the money spent on UHS-II is wasted.

V60 is the sustained write floor, and it covers 4K. For 8K or high-frame-rate ProRes, the Lexar Professional 2000x SDHC UHS-II Card is the V90 option.