Cisco Cisco UCS B440 M2 High-Performance Blade Server データシート

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DIMM voltage:

— You can mix dual voltage DIMMs (operate at either 1.5 V or 1.35 V) and single voltage 

DIMMs (operate at only 1.5 V).

— Dual-voltage DIMMs can be operated in either of these modes:

• Power Saving Mode at a maximum speed of 1066 MHz

• Performance Mode at a maximum speed of 1333 MHz

If you mix both types of DIMMs in your configuration, the server forces all DIMMs to 

operate in Performance Mode.

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Memory mirroring:

If you select the Memory RAS option, be aware that it is available only with an even 

number of memory channels. For example, if you select six DIMMs and select 
Reliability/Availability/Serviceability (RAS), mirroring will go into effect on only two 
channels with two DIMMS per channel (you cannot implement RAS on three channels). In 
this case, two DIMMS would go unused.

For more information regarding memory, see 

.

NOTE:  For memory mirroring, DIMM pairing across buses must be identical. 
If you only have two DIMMs, they need to be the same PID because you have 
one DIMM on each of two buses. 

 

 

If you have four DIMMs in a 2-CPU system, for example, you can have two 
4-GB and two 8-GB DIMMs. One 4-GB/8-GB DIMM pair would located on 
Channel A of CPU 1, and one 4-GB/8-GB DIMM pair would be located on 
Channel D of CPU 2.

 

 

If you have four DIMMs in a 1-CPU system, for example, you can have two 
4-GB and two 8-GB DIMMs. One 4-GB/8-GB DIMM pair would located on 
Channel A of CPU 1, and one 4-GB/8-GB DIMM pair would be located on 
Channel B of CPU 1.