Random-access memory ( RAM / r æ m/) is a form of computer memory that can be read and changed in any order, typically used to store working data and machine code. A 64 bit memory chip die, the SP95 Phase 2 Buffer Memory produced at IBM mid 60s, versus memory core iron rings Example of writable volatile random-access memory: Synchronous Dynamic RAM modules, primarily used as main memory in personal computers, workstations, and servers.