Gbit vs Gb

Gbit and Gb both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gbit	Yes	No	No	No
Gb	Yes	No	No	No

As nouns, Gbit and Gb are synonyms defined as:

Gbit and Gb: a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits

Other synonyms of Gbit include gigabit.

Gbit (noun)	Gb (noun)
a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits	a unit of magnetomotive force equal to 0.7958 ampere-turns
	a unit of information equal to 1000 megabits or 10^9 (1,000,000,000) bits