Datasheet
Cisco UCS C240 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)
66
SUPPLEMENTAL MATERIAL
Memory Population Rules
When considering the memory configuration of your server, you should take into account the following:
■ Each channel has three DIMM slots (for example, channel A = slots A1, A2, and A3).
— A channel can operate with one, two, or three 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 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 third: A3, E3, B3, F3, C3, G3, D3, H3
■ Any DIMM installed in a DIMM socket for which the CPU is absent is not recognized.
■ Observe the DIMM rules shown in Tab le 35
Table 35 DIMM Rules for C240 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, A2, A3) 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 C240 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
See Table 5 on page 20 for
valid LRDIMM and RDIMM 3 DPC
configurations
3 DPC is not supported for UDIMMs