Cisco Systems A03D600GA2 Memory Population Rules, DIMM Rules for C220 M3 Servers, DIMM Parameter

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 Bank1

DIMM Capacity

RDIMM = 4, 8, or 16 GB	DIMMs in the same channel (for
	example, A1 and A2) can have
	different capacities.
LRDIMM = 32 GB	You cannot mix 32 GB LRDIMMs
	with any RDIMM or UDIMM
UDIMM = 4 GB	You cannot mix 4 GB UDIMMs with
	any RDIMM or LRIMM
DIMM Speed

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

1866-, 1600-, or 1333-MHz2	DIMMs will run at the lowest speed
	of the DIMMs/CPUs installed
DIMM Type

DIMMs will run at the lowest speed of the DIMMs/CPUs installed

RDIMMs, LRDIMMs, or UDIMMs	You cannot mix DIMM types in a	You cannot mix DIMM types in a bank
	channel
	1 DPC or 2 DPC	3 DPC
	See Table 5 on page 20 for	Not supported
DIMMs per Channel (DPC)	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

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.

2.Only 1866-, 1600-, and 1333-MHz DIMMs are currently available for the C220 M3 server.

60 Cisco UCS Cisco UCS C220 M3 High-Density Rack Server (Small Form Factor Disk Drive Model)