We talked to Mark E. Lewis from Prograde at this years NAB NY he told us all about their CFast memory cards. CFast™ 2.0 cards deliver a sustained read rate of up to 550MB/s, and sustained write rate of up to 450MB/s. Cinema producers will see precise capture without dropped frames when creating 6K, 4K, Full HD and high bit rate MPEG-4 files. With Video Performance Grade 130, write speed will not drop below 130MB/second.