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About Memory Modules
The Sun Fire 880 server uses 3.3-volt, high-capacity next generation dual inline
memory modules (DIMMs). The DIMMs are built with synchronous dynamic
random access memory (SDRAM) chips that operate at a 75-MHz clock frequency.
The system supports DIMMs with 128-, 256-, and 512-Mbyte capacities, with future
support for higher capacities as they become available.
Each CPU/Memory board contains slots for 16 DIMMs. Total system memory ranges
from a minimum of 1 Gbyte (one CPU/Memory board with eight 128-Mbyte
DIMMs) to a maximum of 32 Gbytes (four boards fully populated with 512-Mbyte
DIMMs).
Within each CPU/Memory board, the 16 DIMM slots are organized into groups of
four. The system reads from, or writes to, all four DIMMs in a group simultaneously.
DIMMs, therefore, must be added in sets of four. The figure below shows the DIMM
slots and DIMM groups on a Sun Fire 880 CPU/Memory board. Every fourth slot
belongs to the same DIMM group. The four groups are designated A0, A1, B0, and
B1.
B 1
B 0
A 1
A 0
B 1
B 0
A 0
A 1
B 1
B 0
A 1
A 0
B 1
B 0
A 1
A 0
64
Sun Fire 880 Server Owner's Guide • August 2001
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