Memory Population Rules - Cisco UCS C240 M3 Manual

Memory Population Rules

When considering the memory configuration of your server, you should take into account the following:
For optimum performance, populate at least one DIMM per memory channel per CPU.
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Each channel has three DIMM slots (for example, channel A = slots A1, A2, and A3).
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When both CPUs are installed, populate the DIMM slots of each CPU identically.
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Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized.
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Observe the DIMM mixing rules shown in
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Table 25
DIMM Parameter Mixed
DIMM Size (4, 8, 16 GB)
DIMM Speed
(1066, 1333, or 1600 MHz)
DIMM Type (R-DIMM)
Notes . . .
1. Only 1333 and 1600 MHz DIMMs are currently available for the C240 M3 server.
Cisco UCS C240 M3 High-Density Rack Server (Large Form Factor Hard Disk Drive Model)
A channel can operate with one or two DIMMs installed.
If a channel has only one DIMM, populate slot 1 first (the blue slot).
Fill bank 1 blue slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1
Fill bank 2 black slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2
Fill bank 3 black slots in the channels second: A3, E3, B3, F3, C3, G3, D3, H3
DIMM Mixing Rules for C240 M3 Server
Mix Across a Single Bank?
No—Must be same size in the
same bank
No—Must be same speed in
the same bank.
1
No—All DIMMs in a bank must
be same type.
Table 25
Mix Across Multiple Banks?
Yes—Different banks can use
different DIMM sizes (as long
as all DIMMs in a single bank
use the same DIMM size).
No—All DIMMs in the server
must be same speed.
No—All DIMMs in the server
must be same type.
SUPPLEMENTAL MATERIAL
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