Source : Free On-Line Dictionary of Computing

Rambus DRAM
     
         A high bandwidth {DRAM}, designed by {Rambus, Inc.}
        of Mountain View, CA.
     
        RDRAM is used mainly for {video accelerators}, and also in the
        {Ultra 64} from {Nintendo}.  It offers sustained {transfer
        rates} of around 1000 Mbps, compared to 200 Mbps for ordinary
        DRAM.  Although it cannot be used as a direct replacement for
        existing memory, it is likely that it will replace DRAM and
        {SDRAM} as the main memory system in {personal computers} as
        the {bus} speeds required by these machines increase.  SDRAM
        can operate up to around 100MHz, but RDRAM has been
        demonstrated by the manufacturers running at 600MHz.
     
        The memory is also only 8 or 9 {bit}s wide, so the bandwidth
        would increase enormously if it were used in parallel to give
        32 or 64-bit memory.
     
        (1996-12-13)