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Because gigabits are ambiguous and misuse the prefix "giga" as defined by the International System of Units, the International Electrotechnical Commission established gibibits in 1998.
A gibibit is always equal to 2^30, or 1,073,741,824 bits or 1024 mebibits.
As a unit of measurement, gibibits are normally used for RAM and ROM capacity.
Gibibits are 1,024 mebibits and precede tebi, pebi, exbi, zebi and yobi in bit measurement.
Very similar to gigabits, which use a less exact prefix established by the International System of Units (SI) but are used much more commonly.