CFExpress cards are made for quickly recording large files. But, storing 5.7K video, or long bursts of RAW files can create another problem: heat. The ProGrade Digital CFExpress Cobalt Type B series uses a metal casing and thermal throttling to help the memory card handle those high heats. As a result, the ProGrade boasts speeds higher than many competing models, with a 1500 MB/s write speed while many others top out at 1200 MB/s.
