The Lexar Professional Type B Card Diamond series is the fastest CFExpress card on the market. With read speeds of up to 1900MB/s and write speeds of 1700MB/s, few other cards or cameras at present come close to the performance.
Not only is the card fast, but it has been fully tested to provide that performance over a full-day shooting. What will also appeal to many videographers is that the card is backwards compatible with XQD cameras, although not all.
Lexar has rigorously tested the card for use in professional systems, so it is marked with the VPG 400 video class specification that guarantees a minimum write speed of 400MB/s.