The memory bus has a much higher data transfer rate than the system bus because of its shorter length, higher clock rate, and (in most computers) large number of parallel communication lines.

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The memory bus is designed to transfer data between the CPU and memory much faster than the system bus which connects all the components of the computer. The memory bus has a shorter length, higher clock rate, and more parallel communication lines, all of which contribute to its higher data transfer rate.

The Memory Bus Has a Much Higher Data Transfer Rate