CAUTION: 
Make sure that all server power cords are disconnected from their power sources before performing 
this procedure.
Important: If you are installing a memory module that is different than the memory module you removed, 
see “Install a memory module” on page 54 for additional information.
Note: The same procedure is used to install memory modules and memory module fillers.
Figure 100. Memory module locations
Table 34.  Memory module locations on each compute system board
DIMM number Compute system 
board 1 (lower 
board, lower tray) 
DIMM number
Compute system 
board 2 (upper 
board, lower tray) 
DIMM number
Compute system 
board 3 (lower 
board, upper tray) 
DIMM number
Compute system 
board 4 (upper 
board, upper tray) 
DIMM number
1
1 25 49 73
2
2 26 50 74
3
3 27 51 75
4
4 28 52 76
5
5 29 53 77
6
6 30 54 78
7
7 31 55 79
8
8 32 56 80
9
9 33 57 81
10
10 34 58 82
11
11 35 59 83
12
12 36 60 84
13
13 37 61 85
Appendix B. Component reference 167