Dell PowerEdge M420 Important Information Manual page 4

Table 1 and Table 2 show the possible memory configurations using 16 GB and
32 GB RDIMMs in two- or four-processor systems.
NOTE:
DIMMs A1-A8 are assigned to processor 1, DIMMs B1-B8 are assigned to
processor 2, and so on.
Table 1. Memory Configurations (Two Processors)
256 16 16
256 8 32
512 16 32
Table 2. Memory Configurations (Four Processors)
256 16 16 x4
512 32 16 x4
512 16 32 x4
1024 32 32 x4
x4 A1,A2,A3,A4,A5,A6,A7,A8
x4 A1,A2,A3,A4
x4 A1,A2,A3,A4,A5,A6,A7,A8
1
A1,A2,A3,A4
A1,A2,A3,A4,
A5,A6,A7,A8
A1,A2,A3,A4
A1,A2,A3,A4,
A5,A6,A7,A8
Processors
1
B1,B2,B3,B4,B5,B6,B7,B8
B1,B2,B3,B4
B1,B2,B3,B4,B5,B6,B7,B8
Processors
2
B1,B2,B3,B4, C1,C2,C3,C4
B1,B2,B3,B4, C1,C2,C3,C4,
B5,B6,B7,B8 C5,C6, C7,C8
B1,B2,B3,B4 C1,C2,C3,C4
B1,B2,B3,B4, C1,C2,C3,C4,
B5,B6,B7,B8 C5,C6,C7,C8
2
3 4
D1,D2,D3,D4
D1,D2,D3,D4,
D5,D6,D7,D8
D1,D2,D3,D4,
D1,D2,D3,D4,
D5,D6,D7,D8