Which is the fastest Computer Memory- Register or Cache?

In a computer, a register is the fastest memory. Register a part of the computer processor which is used to hold a computer instruction, perform mathematical operation as storage address, or any kind of data. The register memory indicates the capacity of the register to hold the size of data it can hold. The capacity varies on the design of the processor and varies for example a 32 bit microprocessor can have 8 bit register giving memory size 256 bits. Registers are extensively used as part of the instruction while performing operations inside the computer processor. Depending on the processor design and language rules, registers may be numbered or have arbitrary names. Registers are temporary memory units that store data and are located in the processor, instead of in RAM, so data can be accessed and stored faster.

Cache memory is extremely fast memory that is built into a computer’s central processing unit (CPU). The data that is stored within a cache might be values that have been computed earlier or duplicates of original values that are stored elsewhere. The CPU uses cache memory to store instructions that are repeatedly required to run programs, improving overall system speed. As the processor of computer processes data, it looks first in the cache memory and if it finds the data there it accesses without accessing original memory area.), it does not have to do the more time-consuming reading of data from larger memory .