About Memory - Sun Microsystems Enterprise 250 Owner's Manual

About Memory

The system's main logic board provides sixteen slots for high-capacity dual inline
memory modules (DIMMs). The system supports Sun standard 200-pin, 5-volt,
60-nanosecond memory modules. Modules of 32-, 64-, and 128-Mbyte capacities can
be installed in the system. Total system memory capacity ranges from 128 Mbytes to
2 Gbytes.
Memory slots are organized into four banks, with each bank comprising four slots.
The system reads from, or writes to, all four DIMMs in a bank at the same time.
DIMMs, therefore, must be added four at a time in the same bank. The following
figure shows the memory banks on the main logic board.
Configuration Rules
Memory DIMMs must be added four at a time within the same bank, and each bank
used must have four identical capacity DIMMs installed (for example, four 32-Mbyte
DIMMs, or four 64-Mbyte DIMMs).
Memory bank A must always be filled.
DIMM capacities can differ from one bank to the next—for example, four 32-Mbyte
DIMMs installed in bank A and four 64-Mbyte DIMMs installed in bank B.
D
C
Memory banks
B
A
Chapter 4 Hardware Configuration 47