Prograde Digital Cobalt 640GB CFast 2.0 Memory Card, 2-Pack

This new family of CFast Cobalt memory cards provide read speeds of up to 550MB/s, burst write speeds of up to 520MB/s, and sustained write speeds of up to 470MB/s - ideally suited for a broad range of still and moving image capture applications. To differentiate the new generation from prior generations, the sustained write speed is now clearly stated on the card's top label.