Information Research Services Updated: 18 August 1997
        The Mariah chip set, an improvement on the Rigel chip set, was manufactured in 1.0 micrometer CMOS technology. The VAX 6500 processor delivered approximately 13 times the power of a VAX-11/780 system, per processor. The 6500 systems (shown here) implemented a new cache technique called write-back cache, which reduced CPU-to-memory traffic on the system bus, allowing multiprocessor systems to operate more efficiently.