Sun Enterprise 250 Server Owner's Guide

About Memory

Figure 5-1  


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.

Figure 5-2  


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.

Memory modules are delicate. Be sure to take appropriate precautions to avoid damaging them through electrostatic discharge. For more information, see "How to Avoid Electrostatic Discharge".

Caution - Caution -

Dual inline memory modules (DIMMs) are made of electronic components that are extremely sensitive to static electricity. Static from your clothes or work environment can destroy the modules. Do not remove any DIMM from its antistatic packaging until you are ready to install it on the system board. Handle the modules only by their edges. Do not touch the components or any metal parts. Always wear a grounding strap when you handle the modules.