In the memory cards CFexpress uses PCIe and the NVMe Protocol
The organization of the CompactFlash Association (CFA) announced the development of a new standard of memory cards. It’s called CFexpress. Unlike previously developed standards, such as CompactFlash, VPG or CFast, it will describe the whole family of removable media of different sizes and performance levels. They have in common is the physical interface and communications Protocol.
The need for a new standard dictated by the growth velocity of flow in professional video. So, stream 4K video in RAW format at a frame rate of 30 fps already corresponds to a steady speed of 400-500 MB/s. of Course, for guaranteed operation without loss of information, this indicator should cover with the stock. With the increase frame rate the thread is growing rapidly, reaching at 120 fps for approximately 1600-2000 MB/s. doesn’t help even data compression.
According to CFA, the development of the family CFexpress has four goals:
In CFexpress is a physical PCIe interface provides high-speed exchange and is widely used in the computer industry. Developers to create specifications of carriers, having from two to eight PCIe. Given that one line PCIe Gen 3 has a theoretical bandwidth of 1 GB/s data transfer rate in CFexpress can reach 8 GB/s.
In addition, in CFexpress NVMe Protocol is used. This ensures compatibility with a wide range of ecosystem components, including controllers, operating system, capture device and workflow. Additionally CFexpress is compatible with the Thunderbolt interface, which is also based on PCIe.