Dell PowerEdge SC1425 - Manual (Page 49)

l If only one memory module is installed, it must be installed in socket DIMM1_A.
l If two or more memory modules are installed, they must be installed in pairs of matched memory size, speed, and technology.
l The system supports both single-ranked and dual-ranked memory modules.
l If you install both single-ranked and dual-ranked memory modules, the dual-ranked memory modules must be installed in bank 1.
l Dual-ranked memory modules are not supported in bank 3.
l If dual-ranked memory modules are installed in bank 2, you cannot install memory modules in bank 3.
Memory modules marked with a 1R are single ranked and modules marked with a 2R are dual ranked. See Figure 6 -8 .
Figure 6-8. Determining a Memory Module's Capacity and Rank
Spare Bank Support
If six identical single-rank memory modules are installed, the memory modules in bank 3 (DIMM3_A and DIMM3_B) can function as a spare bank if you select
the spare bank option using the System Setup program.
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
Table 6-2. Allowable Memory Module Configurations – Single-Ranked and Dual-Ranked Memory Modules
NOTE: All six memory modules must be single-rank modules, identical in size.
Total Memory DIMM1_A DIMM1_B DIMM2_A DIMM2_B DIMM3_A DIMM3_B
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 4 GB 4 GB 1 GB none none none
12 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB
DIMM1_A DIMM1_B DIMM2_A DIMM2_B DIMM3_A DIMM3_B
Single Rank none none none none none
Single Rank Single Rank none none none none
Dual Rank Dual Rank none none none none
Single Rank Single Rank Single Rank Single Rank none none
Dual Rank Dual Rank Dual Rank Dual Rank none none
Dual Rank Dual Rank Single Rank Single Rank none none
Single Rank Single Rank Single Rank Single Rank Single Rank Single Rank
Dual Rank Dual Rank Single Rank Single Rank Single Rank Single Rank