Difference between RAM and ROM

RAM stands for random access memory and ROM stands for read-only memory in your computer.

The RAM is volatile memory that temporarily stores the files you are working on.

ROM is a non-volatile memory that stores permanent instructions for your computer.

RAM and ROM constitute the computer’s internal memories, they differ in terms of their purposes, storage capabilities, physical sizes, and other factors.

Let’s examine their similarities and differences.

So, let’s begin!


What is RAM?


Random Access Memory is the CPU’s internal memory in the system that is held on the computer’s motherboard.

When a computer is turned on, it is made to store data, programmes, and programme results as a computer’s read-write memory since data may be written to and read from it.

RAM is also a volatile memory because it cannot store information and commands indefinitely as compared to ROM.

When we power on a computer, the instructions from the hard disc are preserved in the RAM and the operating system (OS) & other applications required to run a computer.

The tasks necessary to operate the computer are carried out by the CPU using these instructions.

When the computer is functioning, the RAM stores this data but as soon as you turn it off, the RAM deletes the data hence reading data from RAM is quicker and easier than reading it from a hard disc.

Characteristics of RAM:

Here are some crucial RAM characteristics as follows:

  • To launch and load the operating system and applications, RAM chips are frequently needed in a device’s everyday operations.
  • RAM is much quicker to write and read, unlike ROM.
  • Data is stored in RAM, while the computer is running.
  • Multiple gigabytes (GB) of data can be stored on a RAM chip.
  • A 32-bit computer can have 4 GB of RAM, while a 64-bit computer can have 16GB of RAM.

Types of RAM:

  1. DRAM: Dynamic RAM must be refreshed continually to prevent data loss.
  2. SRAM: Static RAM is faster and consumes less power, but costs more.
  3.  SDRAM: It is a RAM that can function at extremely high clock rates.
  4. DDR RAM: Synchronous Random Access Memory is offered by DDR or Double Data Rate.

Advantages of RAM:

Here are a few significant benefits of RAM as follows:

  • Quiet: Since RAM doesn’t have any moving elements, its functioning is entirely silent.
  • Power-saving: Compared to disc drives, RAM consumes a lot less energy.
  • Protects the batteries in your system: It enables you to cut back on carbon emissions and make your battery last longer.

What is ROM?


The Read-Only Memory is a non-volatile memory that keeps data permanently stored even when the power is off.

ROM serves as the computer’s main memory like RAM, the data and programmes stored inside can be read but not written.

At the time of manufacturing, the manufacturer inserts programmes into the ROM that cannot be modified afterwards.

So, once it’s been created, you can’t reprogramme, rewrite, or delete its data, however, altering the data stored in some types of ROM.

The data permanently saved on personal computers, video game console cartridges, and other electrical devices including TVs, air conditioners, smartphones, and tablets are some instances of ROM.

Characteristics of ROM:

Here are some significant ROM memory properties as follows:

  • Data may only be written once but after it’s written, you may read it as many times as you want.
  • Modern computers mostly use ROM chips during start-up.
  • Only a few megabytes (MB) of data, up to 4 MB or more per chip, are stored in ROM, a non-volatile memory.

Types of ROM:

  1. Erasable Programmable Read-only Memory (EPROM): It can be erased by subjecting the memory to ultraviolet radiation, yet it can store instructions.
  2. Programmable Read-Only Memory (PROM): A specific device is used to write or program ROM.
  3. Electrically Erasable Programmable Read-Only Memory (EEPROM): On a unique circuit, it saves and removes instructions.
  4. Mask ROM (MROM): It is one whose contents can only be programmed by an integrated circuit maker.

Advantages of ROM:

The following are some benefits of ROM as follows:

  • Memory is not lost when power is turned off.
  • It cannot be unintentionally altered.
  • Less expensive than RAM.
  • It does not require refreshing because they are static.

What is the difference between RAM and ROM?

Some of the key differences between RAM and ROM are as follows:

RAM is part of the computer’s temporary memory.It serves as the computer’s permanent memory.
It is a read-write memory both writing and reading of the data are possible.It is a read-only memory because only reading is possible with the data.
It is a volatile memory since it only saves the files temporarily while the computer is turned on and functional.It is a non-volatile memory because it keeps the files in its permanent storage even after the power is switched off.
The storage space is 1 to 256 GB.Its storage capacity ranges from 4 to 8 MB.
RAM is larger than ROM and available in two sizes that fit both desktop and laptop.Depending on use, its size can range from less than an inch to several inches in both length and width.
RAM data can be retrieved and changed.Only the information is kept in ROM.
As it has high-speed memory, it is quicker than ROM.It moves more slowly than RAM.
The RAM-stored information is utilised in real-time by the CPU to power the computer.When it has been moved to RAM, the data that was previously stored in ROM be utilised by the CPU.
The files and data that the CPU requires to process the present instructions or work are temporarily stored.The motherboard of a computer houses the BIOS programme that is required to bootstrap the machine.
Examples are the primary memory in a computer and the CPU cache.Examples include microcontrollers, which employ it as firmware.
It is simple to access the stored data.As opposed to ROM, the stored data is not as accessible.
The price is higher than ROM.The price is less than RAM.
SRAM (static random-access memory) and DRAM (dynamic random-access memory) are two types of RAM (Random Access Memory).These include PROMs (programmable read-only memories), EPROMs (erasable programmable read-only memories), EEPROMs (electrically erasable programmable ROMs), and Mask ROMs.


The difference between RAM (Random Access Memory) and ROM (Read Only Memory) is that RAM is volatile.

So, when the device is turned off its contents are lost while ROM stores all the applications needed to initially boot the computer.

Section Under: Differences

Hi, I am Meena Patil, the founder of best-laptop.in/, I did my B.E. Computer. This blog provides honest information related to several laptops, laptop equipment, laptop reviews, buyer's guide and much more.

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