Hardware options installation 46
•
UDIMMs represent the most basic type of memory module and offer lower latency in one DIMM per
channel configurations and relatively low power consumption, but are limited in capacity.
•
RDIMMs offer larger capacities than UDIMMs and include address parity protection.
When information applies to all types of memory, the memory are referred to as DIMMs When memory is
specified as RDIMM or UDIMM, the information applies to only that type of memory. All memory installed in
the server must be the same type.
The server supports the following DIMM speeds:
•
Single-rank and dual-rank PC3-10600 (DDR3-1333) RDIMMs operating at up to 1333 MT/s
•
Single-rank and dual-rank PC3-12800 (DDR3-1600) RDIMMs operating at up to 1600 MT/s
•
Single-rank and dual-rank PC3-10600 (DDR3-1333) UDIMMs operating at up to 1333 MT/s
•
Single-rank and dual-rank PC3-12800 (DDR3-1600) UDIMMs operating at up to 1600 MT/s
Speed, voltage, and capacity
DIMM type
DIMM rank
DIMM capacity
Native speed (MT/s)
Voltage
RDIMM
Dual
8 GB/16 GB
1333/1600
LV/STD
RDIMM
Single
4 GB/8 GB
1333/1600
LV/STD
UDIMM
Dual
4 GB/8 GB
1333/1600
LV/STD
UDIMM
Single
2 GB
1333/1600
LV/STD
Depending on the processor model, the number of DIMMs installed, and whether UDIMMs or RDIMMs are
installed, the memory clock speed can be reduced to 1333 or 1066 MT/s. Clock speed can also be reduced
when using low voltage DIMMs.
Populated DIMM speed (MT/s)
DIMM type
1 DIMM per
channel
1 DIMM per
channel
2 DIMMs per
channel
2 DIMMs per channel
—
1.35V
1.5V
1.35V
1.5V
RDIMM
DDR3-1333
DDR3-1600
DDR3-1333
DDR3-1600
UDIMM
DDR3-1333
DDR3-1600*
DDR3-1333**
DDR3-1600***
* UDIMM is supported at 1DPC at 1600 MT/s at 1.5V using HP SmartMemory only. Third-party memory supports 1DPC
at 1333 MT/s at 1.5V.
** UDIMM is supported at 2DPC at 1333 MT/s at 1.35V using HP SmartMemory only. Third-party memory supports
2DPC at 1066 MT/s at 1.35V.
*** UDIMM is supported at 2DPC at 1600 MT/s at 1.5V using HP SmartMemory only. Third-party memory supports
2DPC at 1066 MT/s at 1.5V.
HP SmartMemory
HP SmartMemory, introduced for Gen8 servers, authenticates and unlocks certain features available only on
HP Qualified memory and verifies whether installed memory has passed HP qualification and test processes.
Qualified memory is performance-tuned for HP ProLiant and BladeSystem servers and provides future
enhanced support through HP Active Health and manageability software.
Certain performance features are unique with HP SmartMemory. HP SmartMemory 1.35V DDR3-1333
Registered memory is engineered to achieve the same performance level as 1.5V memory. For example,
while the industry supports DDR3-1333 RDIMM at 1.5V, the ML350e server supports DDR3-1333 RDIMM up
to 2 DIMMs per channel at 1333 MT/s running at 1.35V. This equates to up to 20% less power at the DIMM