What MBUS CPU modules are available? How can I tell what module(s) is/are in what model of SS10/SS20/SS600?
Three sun models, the SS10, SS20 and the SparcServer 600 series, support
Sun's MBUS. All these machines have two MBUS slots. Both modules must be
of the same type.
SuperSPARC/w cache modules of different speeds are said to work, as are
three-processor systems (by combining a single and a dual module of the
same type), but such configurations are not supported by Sun.
Modules without external cache are not separately clocked, and run at the
clock rate of the MBUS. Modules with external cache are separately clocked,
and must run at a clock rate higher than that of the MBUS.
The SS20 has a switchable 40/50MHz MBUS, the SS600 has a 40MHz mbus, and
the SS10 has a switchable 33/36/40MHz MBUS. Ross sells an SS20 derivitive
called the Hyperstation 30, which has a 66Mhz MBUS.
Warning: different module revisions may or may not work in different
systems. Check the Sun part number. Further, newer modules may require
that the machine have a sufficiently recent PROM revision to work.
Module #CPUS Processor Clck Ex.Cache Comments
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