The Free On-line Dictionary of Computing (19 January 2023):

gigabits per second
gbps

    (Gbps) A unit of information transfer rate equal to one
   billion bits per second.  Note that, while a gigabit is
   defined as a power of two (2^30 bits), a gigabit per second is
   defined as a power of ten (10^9 bits per second, which is
   slightly less) than 2^30).

   (2004-02-10)