Designed for photographers and videographers looking to capture 8K raw and X-OCN footage, plus extended shutter bursts, the 400GB AV PRO MK3 CFexpress v4 Type A Memory Card from Angelbird provides maximum read speeds of 1870 MB/s and maximum write speeds of 1160 MB/s, plus sustained read speeds of 1700 MB/s and sustained write speeds of 1000 MB/s.