Front Of Server - Cisco UCS C240 M4 Installation And Service Manual
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Chapter 3
Maintaining the Server
DIMM Socket Numbering
Figure 3-13
Figure 3-13
DIMM Population Rules
Observe the following guidelines when installing or replacing DIMMs:
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•
•
•
•
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Table 3-5
DIMM Mixing Rules for C240 M4 Servers
DIMM Parameter
DIMM Capacity:
RDIMM = 8 or 16 GB
LRDIMM = 32 or 64 GB
OL-32474-01
shows the numbering of the DIMM sockets and CPUs.
CPUs and DIMM Socket Numbering on Motherboard
CPU 2
Each CPU supports four memory channels.
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CPU1 supports channels A, B, C, and D.
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CPU2 supports channels E, F, G, and H.
Each channel has three DIMM sockets (for example, channel A = slots A1, A2, and A3).
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A channel can operate with one, two, or three DIMMs installed.
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If a channel has only one DIMM, populate slot 1 first (the blue slot).
When both CPUs are installed, populate the DIMM sockets of each CPU identically.
Fill blue #1 slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1
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Fill black #2 slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2
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Fill white #3 slots in the channels third: A3, E3, B3, F3, C3, G3, D3, H3
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Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized. In a
single-CPU configuration, populate the channels for CPU1 only (A, B, C, D).
Memory mirroring reduces the amount of memory available by 50 percent because only one of the
two populated channels provides data. When memory mirroring is enabled, you must install DIMMs
in sets of 4, 6, 8, or 12 as described in
Observe the DIMM mixing rules shown in
DIMMs in the Same Channel
•
You can mix different capacity
DIMMs in the same channel (for
example, A1, A2, A3).
Front of Server
Memory Mirroring and RAS, page
Table
3-5.
DIMMs in the Same Bank
•
Cisco UCS C240 M4 Server Installation and Service Guide
Installing or Replacing Server Components
CPU 1
3-22.
You can mix different capacity DIMMs
in the same bank. However, for optimal
performance DIMMs in the same bank
(for example, A1, B1, C1, D1) should
have the same capacity.
3-21
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