Dell PowerEdge 2800 - Manual (Page 58)

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.
Memory Mirroring Support
The system supports memory mirroring if identical memory modules are installed in bank 1 and bank 2, and no memory modules are installed in bank 3.
Table 6 -2 and Table 6 -3 show examples of different memory configurations. Table 6 -3 lists the various allowable combinations of single- and dual-ranked
memory modules
Table 6-2. Sample Memory Configurations
Table 6-3. Allowable Memory Module Configurations – Single-Ranked and Dual-Ranked Memory Modules
Installing Memory Modules
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 none none none none
12 GB 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB
16 GB 4 GB 4 GB 4 GB 4 GB none none
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
CAUTION: Only trained service technicians are authorized to remove the system cover and access any of the components inside the system. See
your Product Information Guide for complete information about safety precautions, working inside the computer, and protecting against
electrostatic discharge.