    AST RESEARCH, INC.         TECHNICAL BULLETIN #0853               08-02-93

                                POWER EXEC SIM MATRIX

    When selecting an Alternate, always choose low power (LP) part first.  An
    80ns part can be used in a system that uses 80ns DRAMs.  Standard power parts
    (SP) should always be picked last.  Items marked with an "n/a" indicates an
    incompatibility with that Processor Board.

                          Power Exec Processor Board Part Numbers

                     386SL/25     486SL/25 3.3V   486SL/25 5V    486SL/33
                    202476-002      202530-001    202569-001    202569-002

    2MB 80NS LP
    202486-003       Alternate         n/a          n/a           n/a

    2MB 80NS LP
    202531-001       PRIMARY           n/a          n/a           n/a

    4MB 80NS LP
    202486-004       Alternate         n/a        Alternate       n/a

    4MB 80NS LP
    202531-002       PRIMARY           n/a        PRIMARY         n/a

    4MB 70NS LP
    202531-003       Alternate         n/a        Alternate     PRIMARY

    4MB 70NS SP
    202531-004       Alternate         n/a        Alternate     Alternate

    4MB 80NS LP
    202521-001 3.3V    n/a            Alternate     n/a           n/a

    4MB 80NS LP
    202558-001 3.3V    n/a            PRIMARY       n/a           n/a

    8MB 80NS LP
    202487-003       PRIMARY           n/a          n/a           n/a

    8MB 80NS SP
    202532-001       Alternate         n/a          n/a           n/a

    16MB 80NS LP
    202487-004       Alternate         n/a        Alternate       n/a

    16MB 80NS SP
    202532-002       Alternate         n/a        Alternate       n/a

    16MB 70NS LP
    202532-003       Alternate         n/a        Alternate     PRIMARY

    16MB 70NS SP
    202532-004       Alternate         n/a        Alternate     Alternate

    16MB 80NS LP
    202532-005       PRIMARY           n/a        PRIMARY         n/a

    16MB 80NS LP
    202522-001 3.3V    n/a            PRIMARY       n/a           n/a