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The gigabyte per second is a multiple of the unit bit for Data Transfer Rate. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 1.0 × 109 (1 billion, short scale), and therefore 1 gigabyte per second = 1.0 × 109 byte per second = 1000000000 byte per second. The gigabyte per second has the unit symbol GB/s.
The gibibit per second is a multiple of the unit bit for Data Transfer Rate. The prefix gibi (symbol Gi) is defined in the International System of Units (SI) as a multiplier of 230, and therefore 1 gibibit per second = 230 bit per second = 1073741824 bit per second. The gibibit per second has the unit symbol Gibit/s.