Memory bandwidth is the rate at which data can be read from or stored into a semiconductor memory by a processor. Memory bandwidth is usually expressed in units of bytes/second, though this can vary for systems with natural data sizes that are not a multiple of the commonly used 8-bit bytes.
Memory bandwidth that is advertised for a given memory or system is usually the maximum theoretical bandwidth. In practice the observed memory bandwidth will be less than (and is guaranteed not to exceed) the advertised bandwidth. A variety of computer benchmarks exist to measure sustained memory bandwidth using a variety of access patterns. These are intended to provide insight into the memory bandwidth that a system should sustain on various classes of real applications.
Read more about Memory Bandwidth: Conventions, Computation
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“We went to Mannheim and attended a shivaree—otherwise an opera—the one called “Lohengrin.” The banging and slamming and booming and crashing were something beyond belief. The racking and pitiless pain of it remains stored up in my memory alongside the memory of the time that I had my teeth fixed.”
—Mark Twain [Samuel Langhorne Clemens] (1835–1910)