Register vs. Memory: What's the Difference?

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Key Difference

The difference between register and memory is that register holds the data that CPU is currently processing whereas memory holds data and program instructions that the program requires for execution.

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Register vs. Memory

The data that are directly accessed by the processor are store in register and memory in this way speed of CPU is increased. The speed of CPU is increased bits by bits. The register holds the data that CPU is currently processing whereas memory holds data and program instructions that the program requires for execution. Registers are built in the processor itself and are the smallest data holding element. The data that are in the register is directly accessible by the processor. The data instruction that is being accessed by the processor. The main memory of the computer system is a primary memory. The instructions that are to execute currently are stored in primary memory because these instructions are directly used. CPU can directly use registers from main memory for the execution of these instructions. The access of data is accessible, and the accessibility of data in main memory is very fast as compared to secondary memory.  Main memory is also known as internal memory; data bus is used to access the data from internal memory.  The primary memory is volatile whereas secondary memory is not volatile. High speed accessible storage element is registered. Within one CPU clock cycle the processor access the register. Decoding are performed in registers. There are instructions in registers and these registers are accessed by the CPU. There are 16 bit, 32 bit and 63 bit in registers. There are types of registers: data register (16 bit register), address register (16 bit register), Accumulator register (16 bit register), Temporary register (16 bit register), and Program counter (16 bit register). The memory of any computer system plays a very important role, CPU has registers these registers can store 32 bit of any number. There are 32 registers, and these registers are used to store data. There are types of memory; one is a primary memory and secondary memory.

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Comparison Chart

BasisRegister Memory
Meaning The register holds the data that CPU is currently processing

Memory holds data and programs instructions that the program requires for execution.

 

Capacity The register holds 32 to 64 bitsIn computer memory can be from GB to GB
AccessThe register can access data instructions directlyCPU uses memory at a slower rate.
Type There are types of registers: data register (16 bit register), address register (16 bit register), Accumulator register (16 bit register), Temporary register (16 bit register), and Program counter (16 bit register).Type of memory is RAM.

 What is a register?

Registers are built in the processor itself and are the smallest data holding element. The data that are in the register is directly accessible by the processor. The data instruction that is being accessed by the processor. High speed accessible storage element is registered. Within one CPU clock cycle the processor access the register. Decoding is performed in registers. There are instructions in registers, and these registers are accessed by the CPU. There are 16 bit, 32 bit and 63 bit in registers. There are types of registers: data register (16 bit register), address register (16 bit register), Accumulator register (16 bit register), Temporary register (16 bit register), and Program counter (16 bit register).

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What is Memory?

The memory of any computer system plays a very important role, CPU has registers these registers can store 32 bit of any number. There are 32 registers, and these registers are used to store data. There are types of memory; one is a primary memory and secondary memory. The main memory of the computer system is a primary memory. The instructions that are to execute currently are stored in primary memory because these instructions are directly used. CPU can directly use registers from main memory for the execution of these instructions. The access of data is accessible, and the accessibility of data in main memory is very fast as compared to secondary memory.  Main memory is also known as internal memory; data bus is used to access the data from internal memory.  The primary memory is volatile whereas secondary memory is not volatile.

Primary Memory

The main memory of the computer system is a primary memory. The instructions that are to execute currently are stored in primary memory because these instructions are directly used. CPU can directly use registers from main memory for the execution of these instructions. The access of data is accessible, and the accessibility of data in main memory is very fast as compared to secondary memory.  Main memory is also known as internal memory; data bus is used to access the data from internal memory.  The primary memory is volatile whereas secondary memory is not volatile. In volatile memory, data is not saved permanently because sometimes power is gone. Primary memory is a semiconductor memory; secondary memory is less expensive than primary memory. The data of primary memory is very limited, and the limitation of primary memory is less than secondary memory. There are types of primary memory such as RAM that is random access memory and ROM that is read only memory. RAM that is random access memory can read and write memory that data that is to be currently executed in is stored in RAM. The data in RAM is directly accessible. RAM is a volatile memory as data is lost as power is lost. ROM, on the other hand, is read only memory, the value that is stored in ROM can be altered that’s why it is known as read only memory. When the system is booted, ROM is used to boot the system. There are types of ROM that are EPROM, EROM, PROM.

Secondary Memory

Secondary memory is also known as auxiliary memory, the data that is supposed to be stored permanently in computer memory is stored in secondary memory. The data in secondary memory is not directly accessible by ROM.  The data is first copied to primary memory and then then is stored in secondary memory. The accessibility of data from secondary memory is very slow as compared to primary memory. The secondary memory is a non-volatile memory as the data is saved even when power is lost. There is a magnetic memory that is also known as optical memory in secondary memory, and these are cheaper than primary memory. The secondary memory is not important for the proper working of the computer system. Hard disk, floppy disk, CD and DVD are examples of secondary memory.

Key Differences

  1. The register holds the data that CPU is currently processing whereas Memory holds data and program instructions that the program requires for execution.
  2. The register holds 32 to 64 bits whereas in computer memory can be from GB to GB.
  3. The register can access data instructions directly whereas CPU uses memory at a slower
  4. There are types of registers: data register (16 bit register), address register (16 bit register), Accumulator register (16 bit register), Temporary register (16 bit register), and Program counter (16 bit register) whereas the type of memory is RAM.

Explanatory Video