RAM (Random Access Memory) Vs. ROM (Read Only Memory)

There are several differences between the Random access memory and read-only memory which is given below:

RAM (Random Access Memory ) ROM (Read Only Memory)
1. The RAM is the volatile memory which can store the data as long as the electric power is supplied. 1. The ROM is the non-volatile memory, which can store the data even the electrical power supply is turned off. The data or information is saved in the absence of electrical power in this memory.
2. The data or information stored in RAM can be retrieved or altered. 2. We are not able to retrieve or change the information or data which is stored in ROM memory. The data stored in the ROM memory is only readable data.
3. The RAM is high-speed memory. 3. The ROM memory is quite slower than RAM.
4. It is used to store the data that has been currently processed by the CPU temporarily. 4. The Read-only memory is used to store the instructions which are required during the bootstrap of the computer.
5. The CPU can access the data which is stored in volatile memory. 5. The CPU cannot access that data which is stored in non-volatile memory.
6. Random-access memory is large in size with higher capacity. 6. The Read-only memory is small in size with less capacity.
7. The RAM is used as CPU cache memory in the primary memory. 7. ROM is used as the firmware, in the microcontroller.
8. It is very costly as compared to other memory of the computer system. 8. It is cheaper than the Random access memory.
9. The data is easily accessible in the RAM. 9. The information or data is not easily available in ROM as compared to RAM.
10. The RAM chip is used in the ordinary operations of the computer, once the operating system is loaded.  10. The ROM chip is used primarily in the startup process of the computer.
11. The RAM chip memory can store the data in the Gigabytes, and the range is 1 to 256 GB per chip. 11. The ROM chip memory can store the data in Megabytes, and the range is 4 to 8 MB per chip.
12. We can say that the RAM is used for the temporary storage of data.  12. The ROM memory is used for the permanent storage of data.
13. The data can be accessed Randomly at any time, in any order, and from any physical location; it allows quick access and manipulation of data. 13. The ROM contains programming which is needed to start the computer, that programming is essential for the boot-up before the system software loads.
14. Random-access memory is the chip that is in the form of a rectangle and inserted over the motherboard of the computer. 14. The Read-only memories are generally the optical drivers which are made of magnetic tapes.
15. RAM is categorized into two types they are: Static Random access memory (SRAM) and Dynamic Random access memory (DRAM). 15. ROM is divided into three types: they are PROM (Programmable Read-only memory), EPROM (Erasable programmable Read-only memory) and EEPROM (Electrically Erasable Programmable Read-only memory).
16. The user can perform both read and write operations on that data or information which is stored in RAM. 16.  ROM memory allows the user to read the information or data, but we cannot perform the write operation in ROM.

DRAM (Dynamic Random Access Memory) Vs. SRAM (Static Random Access Memory)

DRAM (Dynamic Random Access Memory) SRAM (Static Random Access Memory)  
1. The Dynamic Random access memory is made up of tiny capacitors that leak the electricity. 1. Static Random access memory is composed of circuits which are similar to D flip-flops.
2. The DRAM generates less heat when it is working.  2. The SRAM generates more heat.
3. It uses less electrical power. 3. It uses more electricity power when this memory is active.
4. Dynamic RAM is used for the main memory.  4.  The Static RAM is used for the cache memory.
5. We can store many bits per chip of DRAM. 5. The SRAM is not capable of storing many bits per chip.
6.  It is not more expensive. 6. The Static Random access memory is costly than the other memories.
7. It requires the recharge every few seconds to maintain the data or information. 7. The Static RAM holds the data or information as long as the electric power is available.
8. It uses the single transistor and capacitor for each memory cell. 8. It uses the array of six transistors to each memory cell.
9. The data accessibility is slower of Dynamic Random access memory. 9. Data accessibility is faster as compared to DRAM.
10. We need to refresh the memory cell after each reading of the capacitor in the Dynamic RAM. 10. The Static RAM does not require a refresh cycle to the memory cell.
11. The DRAM has a high density. 11. The SRAM has a low density as compared to Dynamic Random access memory.
12. It has a simply designed structure. 12. It has a sophisticated structure design due to flip-flop.
13. Dynamic Random access memory is present on the motherboard. 13. The Static Random access memory is present on the processors or between the Processor and main memory.
14. The size of dynamic RAM is 1GB to 2 GB in smartphones and tablets, 4GB to 16 GB in laptops. 14. The size of Static RAM is 1MB to 16 MB.
15. The Dynamic RAM is not fast in speed as compared to static RAM. 15. The speed rate of static RAM is very fast.
16.  The DRAM requires more time to access the data or information. 16. The SRAM requires a minimum time to access the data.
17. Dynamic Random access memory is used in the main memory. 17. The static Random access memory is used in cache memory.

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