JSS2: COMPUTER STUDIES – 1ST TERM Computer Memory: Primary And Secondary Memory | Week 3 Differences between RAM and ROM

Lesson 3, Topic 4

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Differences between RAM and ROM

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Differences between RAM and ROM

Below are some key differences between RAM and ROM:

RAM Vs. ROM

S/N	RAM	ROM
1.	It is a temporary memory of the computer.	It is the permanent memory of the computer.
2.	It is a read-write memory. The data can be written and read.	It is a read-only memory. The data can only be read.
3.	It is a volatile memory as it temporarily stores the files as long as the computer is on and working.	It is a non-volatile memory as it permanently stores the files even when the power is turned off.
4.	The storage capacity ranges from 1 to 256 GB.	Its storage capacity ranges from 4 to 8 MB.
5.	It is bigger in size than ROM.	It is smaller in size than RAM.
6.	Data stored in RAM can be retrieved and altered.	We can only read the data stored in ROM. It cannot be altered.
7.	It is faster than ROM as it is a high-speed memory.	It is slower than the RAM.
8.	The data stored in RAM is used by the CPU in real-time to run the computer.	The data stored in ROM is used by the CPU only when it is transferred to RAM.
9.	Examples: It is used as CPU Cache, Primary Memory in a computer.	Examples: It is used for things like printer software or computer startup programs.
10.	The stored data is easy to access.	The stored data is not as easy to access as it is in ROM.
11.	It is more expensive than ROM.	It is cheaper than RAM.
12.	Types: DRAM (Dynamic Random Access Memory) SRAM (Static Random Access Memory) SDRAM (Synchronous Dynamic Random Access Memory) DDR SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory)	Types: PROM (programmable read-only memory) EPROM (Erasable Programmable Read-only Memory) EEPROM (Electrically Erasable Programmable ROM)