Datasheet

Cisco UCS Cisco UCS C220 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
SUPPLEMENTAL MATERIAL
53
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 31
Table 31 DIMM Rules for C220 M3 Servers
DIMM Parameter Mix Across a Single Bank? Mix Across Multiple Bank?
DIMM Size
RDIMM = 4, 8, or 16 GB
LRDIMM = 32 GB
UDIMM = 4 GB
No—Must be same size in the
same bank.
You cannot mix 32 GB LRDIMMs
with any RDIMM or UDIMM
You cannot mix 4 GB UDIMMs with
any RDIMM or LRIMM
Yes—Different banks can use
different DIMM sizes (as long as all
DIMMs in a single bank use the same
DIMM size).
You cannot mix 32 GB LRDIMMs with
any RDIMM or UDIMM
You cannot mix 4 GB UDIMMs with
any RDIMM or LRIMM
DIMM Speed
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.
Yes—but if DIMMs of mixed speed
are used, the server will clock down
to the lowest speed.
DIMM Type
RDIMMs, LRDIMMs, or
UDIMMs
You cannot mix DIMM types You cannot mix DIMM types
DIMMs per Channel (DPC)
1 DPC or 2 DPC
RDIMMs and LRDIMMs run at 1333 MHz at either 1.35 V or 1.5 V
UDIMMs run at 1066 MHz at 1.35 V and 1333 MHz at 1.5 V