1, Function: DDR4 is a memory technology, which improves performance and bandwidth while reducing the energy consumption of the overall computing environment. The speed per pin of DDR4 exceeds 2Gbps. SSD is a computer storage device that mainly uses flash memory as permanent memory.

2. Usage: DDR4 can be used in various types of computers, including desktops, laptops, servers, etc. In addition, DDR4 memory sticks are also widely used in fields with high performance requirements, such as big data processing, virtualization technology, games and so on. SSD can be used as the main hard disk of a computer to store operating system, applications and user data. Compared with mechanical hard disk, SSD can provide faster startup speed and application loading speed, thus improving the overall performance of the computer.