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Cisco UCS Cisco UCS C220 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
50
SUPPLEMENTAL MATERIAL
Memory Population Rules
When considering the memory configuration of your server, you should consider the following items:
■ For optimum performance, populate at least one DIMM per memory channel per CPU. If
using 4 GB DIMMs, you must populate 2 DIMMs per CPU memory channel.
■ The server supports registered DIMMs (RDIMMs) or load-reduced DIMMS (LRDIMMs), however,
do not mix RDIMMs and LRDIMMs in a server.
■ Each channel has two DIMM slots (for example, channel A = slots A1 and A2).
— A channel can operate with one or two 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 slots in the channels first: A1, E1, B1, F1, C1, G1, D1, H1
— Fill black slots in the channels second: A2, E2, B2, F2, C2, G2, D2, H2
■ Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized.
■ Observe the DIMM mixing rules shown in Table 26
Table 26 DIMM Mixing Rules for C220 M3 Server
DIMM Parameter Mixed Mix Across a Single Bank? Mix Across Multiple Banks?
DIMM Size (4, 8, 16 GB) No—Must be same size in the
same bank
Yes—Different banks can use
different DIMM sizes (as long
as all DIMMs in a single bank
use the same DIMM size).
DIMM Speed
(1066, 1333, or 1600 MHz)
1
Notes . . .
1. Only 1333 and 1600 MHz DIMMs are currently available for the C220 M3 server.
No—Must be same speed in
the same bank.
No—All DIMMs in the server
must be same speed.
DIMM Type (R-DIMM) No—All DIMMs in a bank must
be same type.
No—All DIMMs in the server
must be same type.