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Cisco UCS C240 Server Installation and Service Guide
OL-25761-01z
Chapter 3 Maintaining the Server
Installing or Replacing Server Components
DIMM Slot Numbering
shows the numbering of the DIMM slots.
Figure 3-14
CPUs and DIMM Slots on Motherboard
DIMM Population Rules
Observe the following guidelines when installing or replacing DIMMs:
•
Each CPU supports four memory channels.
–
CPU1 supports channels A, B, C, and D.
–
CPU2 supports channels E, F, G, and H.
•
Each channel has three DIMM slots (for example, channel A = slots A1, A2, and A3).
–
A channel can operate with one, two, or three DIMMs installed.
–
If a channel has only one DIMM, populate slot 1 first (the blue slot).
•
When both CPUs are installed, populate the DIMM slots of each CPU identically.
–
Fill blue #1 slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1
–
Fill black #2 slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2
–
Fill black #3 slots in the channels third: A3, E3, B3, F3, C3, G3, D3, H3
Front of Server
CPU 1
CPU 2
F3
F2
F1
E3
E2
E1
G1
G2
G3
H1
H2
H3
B3
B2
B1
A3
A2
A1
C1
C2
C3
D1
D2
D3
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