Cisco Systems A03D600GA2 manual Caveats, DIMM Memory Speeds, Do not mix RDIMMs, LRDIMMs, or UDIMMs

CONFIGURING the SERVER

Caveats

■System speed is dependent on how many DIMMs are populated per channel. See Table 5 for details.

Table 5 DIMM Memory Speeds

		1333-MHz Capable CPU				1600-MHz Capable CPU				1866-MHz Capable CPU
		LRDIMM		RDIMM		LRDIMM		RDIMM		LRDIMM		RDIMM
DIMM				(DR, SR)				(DR, SR)				(DR, SR)
	DPC
Speed
		Voltage		Voltage		Voltage		Voltage		Voltage		Voltage
		1.3 V	1.5 V	1.3 V	1.5 V	1.3 V	1.5 V	1.3 V	1.5 V	1.3 V	1.5 V	1.3 V	1.5 V
1333	1DPC	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333
DIMM	2DPC	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333	1333
1600	1333	1333	1333	1333	16001	16002	1333	1600	16002	16002	1333	1600	1333
DIMM
	1333	1333	1333	1333	16002	16002	1333	1600	16002	16002	1333	1600	1333
1866	1DPC	NA1	1333	NA1	1333	NA1	1600	NA1	1600	NA1	1866	NA1	1866
DIMM2	2DPC	NA1	1333	NA1	1333	NA1	1600	NA1	1600	NA1	1866	NA1	1866

Notes . . .

1.These DIMMs operate at 1333 MHz instead of 1600 MHz when used with any E5-2600 CPUs. They operate at 1600 MHz when used with E5-2600 v2 CPUs that support 1600- and 1866-MHz speeds.

2.1866-MHz DIMMs are only offered and supported with E5-2600 v2 CPU-configured servers

■For optimum performance, do not mix DIMMs with different frequencies. If you mix DIMM frequencies, the system defaults to the lower frequency.

■Do not mix RDIMMs, LRDIMMs, or UDIMMs

■DIMMs for CPU 1 and CPU 2 (when populated) must always be configured identically.

■The server supports 1 or 2 DIMMs per channel for single- or dual-rank RDIMMs.

■The server supports 1 or 2 DIMMs per channel for quad-rank LRDIMMs.

■When using mirroring, DIMMs must be installed in identical pairs across paired DDR3 buses. That is, mirrored pairs in channels A and B must be identical and pairs in channels C and D must be identical. However, the DIMMs used in channels A and B and in C and D can be different.

■Non-ECC DIMMs are not supported.

■Memory mirroring reduces the amount of available memory by 50% (quantity of DIMMs must be even for mirroring).

■When single- and dual-rank DIMMs are populated for 2DPC, always populate the dual rank DIMM in the blue DIMM slot, and the single-rank DIMM in the black DIMM slot (only the 4GB DIMMs are single-rank).

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