What is the job of the Ram chip?

Answer 1

1. L1 Cache - Store copies of very very frequently needed L2 Cache contents (Usually divided into separate Instruction L1 Cache and Data L1 Cache), faster memory than L2 Cache
2. L2 Cache - Store copies of very frequently needed L3 Cache contents, faster memory than L3 Cache
3. L3 Cache - Store copies of frequently needed RAM contents, faster memory than RAM
4. RAM - Store instructions and data of active programs, much faster memory than Disk
5. Virtual Memory - Operating System managed software mechanism for "expanding" RAM beyond what physically exists by dynamically swapping pages of RAM back and forth between a reserved area or file on Disk, as needed
6. Disk - Store instructions and data of inactive programs (and Virtual Memory contents)

The memories of L1 Cache through RAM are all based on various RAM technologies, with L1 being most expensive per bit and RAM least expensive per bit, but only a little L1 is used and lots of RAM is used.