Sun Microsystems 220R service manual How to Install a Memory Module, 1 Configuration Rules

3.2How to Install a Memory Module

Memory modules for this system are dual inline memory modules (DIMMs). Each DIMM bank must contain four DIMMs of equal density (for example, four 64-Mbyte DIMMs) to function properly. Supported DIMM configuration options are 32, 64, and 128 megabytes. See the Sun Enterprise 220R Server Owner's Guide for more information about memory.

3.2.1Configuration Rules

The following memory configuration rules apply to your system:

At least one memory bank (all four bank slots) must be filled for the system to boot.

4DIMMs must be added four at a time within the same bank.

DIMM capacities can differ from one bank to the next—for example, four 64-Mbyte DIMMs installed in bank 0 and four 128-Mbyte DIMMs installed in bank 2 is permissible.

Refer to the following diagram for memory locations in your system.

90 Sun Enterprise 220R Server Service Manual ♦ January 2000, Revision A