Dell PowerEdge 1800 - Manual (Page 79)

Installing System Options
79
General Memory Module Installation Guidelines
• If only one memory module is installed, it must be a 256 MB module installed in socket
DIMM_1A.
• If two or more memory modules are installed, they must be installed in pairs of matched
memory size, speed, and technology.
• Install memory modules in order of decreasing capacity, beginning with bank 1, then bank 2,
and then bank 3.
• The system supports both single-ranked and dual-ranked memory modules.
Memory modules marked with a 1R are single ranked and modules marked with a 2R are dual
ranked.
• If you install both single-ranked and dual-ranked memory modules, the dual-ranked memory
modules must be installed in bank 1, regardless of capacity.
NOTE:
Dual-rank memory modules with less capacity take precedence over single-ranked memory
modules with greater capacity.
• Dual-ranked memory modules are not supported in bank 3.
Table 6-1 and Table 6-2 show examples of different memory configurations. Table 6-2 lists the
various allowable combinations of single- and dual-ranked memory modules.
Table 6-1. Sample Memory Configurations
Total Memory DIMM_1A DIMM_1B DIMM_2A DIMM_2B DIMM_3A DIMM_3B
256 MB 256 MB none none none none none
1 GB 256 MB 256 MB 256 MB 256 MB none none
1 GB 512 MB 512 MB none none none none
2 GB 512 MB 512 MB 512 MB 512 MB none none
2 GB 1 GB 1 GB none none none none
3 GB 1 GB 1 GB 512 MB 512 MB none none
3 GB 512 MB 512 MB 512 MB 512 MB 512 MB 512 MB
4 GB 1 GB 1 GB 1 GB 1 GB none none
4 GB 1 GB 1 GB 512 MB 512 MB 512 MB 512 MB
6 GB 2 GB 2 GB 1 GB 1 GB none none
6 GB 1 GB 1 GB 1 GB 1 GB 1 GB 1 GB
8 GB 2 GB 2 GB 2 GB 2 GB none none
8 GB 2 GB 2 GB 1 GB 1 GB 1 GB 1 GB
12 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB