What has the fastest access speed?

The fastest access speed is the CPU internal register. Each register inside the CPU has specific functions and uses. The most common register functions are to store addresses, place intermediate calculation results, and reduce access to memory; these registers are used very frequently inside the CPU and have the fastest access speed.

Each register within the CPU has specific functions and uses. The most common register functions are to store addresses, place intermediate calculation results, and reduce access to memory. These registers are used very frequently inside the CPU and have the fastest access speed.

Usually, a small-capacity cache Cache is set up between the CPU and the main memory. Data with high access probability is stored in the Cache based on the locality principle of the program, which greatly improves the performance of the system.

Obviously, the access speed of computer main memory is much greater than the access speed of external memory such as magnetic disks, optical disks, etc.

To sum up, The access speed from high to low is: CPU internal registers, Cache, main memory and disk.

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