Chapter 3 Hardware Configuration 51
About Memory Modules
The Sun Fire V890 server uses 3.3-volt, high-capacity 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 512-Mbyte and 1-Gbyte capacities.
Each CPU/Memory board contains slots for 16 DIMMs. Total system memory
available is 64 Gbytes (four boards fully populated with 1-Gbyte 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 V890
CPU/Memory board. Every fourth slot belongs to the same DIMM group. The four
groups are designated A0, A1, B0, and B1.
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