Hardware Owner's Manual

Installing Blade Components 183
• If pairs of memory modules of different sizes are installed, the larger
capacity memory modules must be installed in the lower numbered slots.
• Memory sparing is supported if 24 memory modules are installed.
(Memory mirroring is not supported.)
Table 3-4 shows examples of supported memory configurations.
CAUTION: Memory module blanks must be installed in unoccupied memory
sockets to maintain proper cooling airflow.
Table 3-4. Examples of PowerEdge M905 Memory Configurations
Total
System
Memory
Memory Modules -
Number and Size
Memory Module Locations
8 GB Eight 1 GB A1, A2, B1, B2, C1, C2, D1, D2
16 GB Sixteen 1 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
16 GB Eight 2 GB A1, A2, B1, B2, C1, C2, D1, D2
32 GB Eight 4 GB A1, A2, B1, B2, C1, C2, D1, D2
32 GB Sixteen 2 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
48 GB Twenty-four 2 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
64 GB* Eight 8 GB A1, A2, B1, B2, C1, C2, D1, D2
64 GB* Sixteen 4 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
96 GB Twenty-four 4 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
128 GB Sixteen 8 GB A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
192 GB Twenty-four 8 GB A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
*If 64 GB of memory is installed, the system recognizes only 63.75 GB during POST.