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Cisco UCS Cisco UCS C220 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
60
SUPPLEMENTAL MATERIAL
Memory Population Rules
When considering the memory configuration of your server, you should consider the following items:
■ 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 32
Table 32 DIMM Rules for C220 M3 Servers
DIMM Parameter DIMMs in the Same Channel
DIMM in the Same Bank
1
Notes . . .
1. Although you can have different DIMM capacities in the same bank, this will result in less than optimal
performance. For optimal performance, all DIMMs in the same bank should be identical.
DIMM Capacity
RDIMM = 4, 8, or 16 GB
LRDIMM = 32 GB
UDIMM = 4 GB
DIMMs in the same channel (for
example, A1 and A2) can have
different capacities.
You cannot mix 32 GB LRDIMMs
with any RDIMM or UDIMM
You cannot mix 4 GB UDIMMs with
any RDIMM or LRIMM
For best performance, DIMMs in the
same bank (for example, A1, B1, C1,
D1) should have the same capacity.
You cannot mix 32 GB LRDIMMs with
any RDIMM or UDIMM
You cannot mix 4 GB UDIMMs with any
RDIMM or LRIMM
DIMM Speed
1866-, 1600-, or 1333-MHz
2
2. Only 1866-, 1600-, and 1333-MHz DIMMs are currently available for the C220 M3 server.
DIMMs will run at the lowest speed
of the DIMMs/CPUs installed
DIMMs will run at the lowest speed of
the DIMMs/CPUs installed
DIMM Type
RDIMMs, LRDIMMs, or UDIMMs You cannot mix DIMM types in a
channel
You cannot mix DIMM types in a bank
DIMMs per Channel (DPC)
1 DPC or 2 DPC 3 DPC
See Table 5 on page 20 for
valid LRDIMM and RDIMM 1 DPC and
2 DPC memory configurations
UDIMMs run at 1066 MHz at 1.35 V
and 1333 MHz at 1.5 V
Not supported