Difference Between RAM and ROM

Today’s generation uses a computer for everything. The most important and common activity done in computers is storing the data and files.


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But for storing files and other data in devices (phones or computers), memory is required. For example, RAM and ROM are types of memories sued for storing data inside electronic devices.

RAM and ROM both are used for a similar function, i.e. storing data. Except these also they are similar in many ways, but that does not mean they are the same.

They have several differences among them. And to choose the best you should know them deeply.

Key Takeaways

  1. RAM is volatile memory, and ROM is non-volatile memory.
  2. RAM stores temporary data, and ROM contains permanent data or firmware.
  3. RAM can be read and written to, and ROM is read-only or limited write capability.


RAM (Random Access Memory) is a volatile memory that is used to store data that are currently being used by the computer, while ROM (Read-Only Memory) is a non-volatile memory that is used to store program instructions that are essential for the computer to operate, even when it is turned off.


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RAM or Random Access Memory is where the data of the computer is stored. It only stores the information and data that the computer is actively using.

Therefore, it is beneficial for such use as for more programs, more memory is required, which increases the use of RAM. It has certain benefits over ROM, except it is more expensive.

ROM or Read-Only Memory is used in electronic devices where data cannot be modified after the manufacture of the device. It is slower and has a lower capacity than the RAM.

It is used in modern computers mostly. Despite all the disadvantages, it is considered to be less expensive, and everyone can afford it.

Comparison Table

Parameters of ComparisonRAMROM
SpeedHigher speedSlower speed
CapacityHigh capacityLower capacity
Modifies and erasedCan be modified and erasedCannot be modified and erased
VolatileMuch volatileLess volatile
AffordableLess affordableMore affordable

What is RAM?

The RAM is a type of computer’s memory. It can be read or changed as per convenience.

It is mostly used for storing the data and machine code. Several types of RAM include the following:

  1. SRAM (Static Random Access Memory): it uses multiple transistors that are more than 3. It has certain advantages such as it is simpler, good performance, reliable, uses low idle power consumption and also certain disadvantages such as its density, its price, it requires high power consumption for operation.
  2. DRAM (Dynamic Random Access Memory): memory is paired with only a single transistor (unlike SRAM) and capacitor. It is more complicated in nature but still has an advantage due to its simple cell structure. It is more affordable when compared with SRAM.
  3. VRAM (Video Random Access Memory): it also called Multiport Dynamic Random Access Memory. Mainly used for 3-D accelerators. It has two independent ports. When compared to SRAM is more expensive; therefore, SRAM is used more.

Advantages of RAM:

  1. It maximizes the speed of the computer’s system.
  2. Allow storage of data inside the system.
  3. It is faster than hard drive storage.
  4. More power efficient.
  5. Much affordable than SSD and also faster.

Disadvantages of RAM:

  1. It is sometimes slow when compared to ROM.
  2. It is less affordable.

What is ROM?

It falls under the category of non-volatile memory. Data inside this type of memory cannot be changed or erased.

It allows only to read the data. It a hard-wired and include a system that cannot be changed electronically.

There are various types of ROM such as:

  1. Masked Read-Only Memory or MROM: this type cannot be modified as it is original.
  2. Programmable Read-Only Memory or PROM: it cannot be programmed after the chip has been created. Information is permanent. Hence no modification or changes can be made.
  3. Erasable Programmable Read-Only Memory or EPROM: Dov Frohman was developed in 1971. No new data can be saved in it as it cannot be modified. It is not used commonly in computer systems.
  4. Electrically Erasable Programmable Read-Only Memory or EEPROM: data in it can be reprogrammed and erased. Data that can be stored in the system is not on. It is more powerful than other types.

Advantages of ROM:

  1. It is non-volatile.
  2. They don’t need static time.
  3. Comparatively simpler circuitry.
  4. Permanent storage of data is also an option.

Disadvantages of ROM:

  1. It cannot be modified.
  2. No changes can be made in any case.

Main Differences Between RAM and ROM

  1. While RAM is very less affordable by everyone, ROM is considered to be the most and ideal affordable option in comparison.
  2. When it comes to speed, Random Access Memory has the upper hand and is faster than the Read-only Memory, which is relatively slow.
  3. Like speed, Random Access Memory has more capacity than Read-only Memory that has lower capacity in comparison.
  4. As the name suggests, Read-only Memory data it can only be read, not modified, or erased, while in Random Access Memory, the data can also be erased and modified.
  5. Central Processing Unit uses data stored in RAM is used for the current instructions process, while for bootstrapping, the computer data stored in ROM is used.
  6. Data stored inside Random Access Memory can be easily accessed for the process of the Central Processing Unit, whereas for the same data stored in Read-only Memory, there are steps that have to be done.
  7. Random-access Memory is much more volatile as it is safer and more reliable for data storage until there is an interruption of power in between, while when compared, Read-only Memory is less volatile as it is permanent.
Difference Between RAM and ROM
  1. https://ieeexplore.ieee.org/abstract/document/669502/
  2. https://ieeexplore.ieee.org/abstract/document/6894616/
  3. https://link.springer.com/chapter/10.1007/3-540-44614-1_76
  4. https://ieeexplore.ieee.org/abstract/document/1052508/
  5. https://ieeexplore.ieee.org/abstract/document/4069932/
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