Dell PowerEdge M620 Owner's Manual page 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 Memory Modules -
System Number and Size
Memory
8 GB Eight 1 GB
16 GB Sixteen 1 GB
16 GB Eight 2 GB
32 GB Eight 4 GB
32 GB Sixteen 2 GB
48 GB Twenty-four 2 GB
64 GB* Eight 8 GB
64 GB* Sixteen 4 GB
96 GB Twenty-four 4 GB
128 GB Sixteen 8 GB
192 GB Twenty-four 8 GB
*If 64 GB of memory is installed, the system recognizes only 63.75 GB during POST.
Memory Module Locations
A1, A2, B1, B2, C1, C2, D1, D2
A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
A1, A2, B1, B2, C1, C2, D1, D2
A1, A2, B1, B2, C1, C2, D1, D2
A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
A1, A2, B1, B2, C1, C2, D1, D2
A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3,
C4, D1, D2, D3, D4
A1, A2, A3, A4, A5, A6, A7, A8, B1, B2, B3,
B4, B5, B6, B7, B8, C1, C2, C3, C4, D1, D2,
D3, D4
Installing Blade Components
183