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• Quad-rank PC3L-10600 (DDR3-1333) LRDIMMs operating at up to 1333 MT/s
Speed, voltage, and capacity
DIMM type DIMM rank DIMM capacity Native speed (MT/s) Voltage
RDIMM
Single-rank 4 GB 1600 STD
RDIMM
Dual-rank 8 GB 1333 LV
RDIMM
Single-rank 8 GB 1600 STD
RDIMM
Dual-rank 16 GB 1333 LV
RDIMM
Dual-rank 16 GB 1600 STD
LRDIMM
Quad-rank 32 GB 1333 LV
UDIMM
Single-rank 2 GB 1333 LV
UDIMM
Dual-rank 4 GB 1333 LV
UDIMM
Dual-rank 8 GB 1333 LV
Depending on the processor model, the number of DIMMs installed, and whether LRDIMMs, UDIMMs, or
RDIMMs are installed, the memory clock speed can be reduced to 1333 or 1066 MT/s.
Populated DIMM speed (MT/s)
DIMM type DIMM rank 1 DIMM per channel 2 DIMMs per channel
RDIMM
Dual-rank (8 GB) 1333 1333
RDIMM
Single-rank (8 GB) 1600 1600
RDIMM
Dual-rank (16 GB) 1333 1333
LRDIMM
Quad-rank (32 GB) 1333 1333
UDIMM
Dual-rank (8 GB) 1333 1333*
* UDIMM is supported at 2DPC at 1333 MT/s using HP SmartMemory only. Third-party memory supports up to 2DPC
at 1066 MT/s.
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, compared to 1.8V for DDR-2 DIMMs. DDR3 Low
Voltage DIMMs operate at 1.35V. For HP ProLiant Gen8 servers, the majority of new DDR3 DIMMs are Low
Voltage as HP SmartMemory enables the same performance as 1.5V. This equates to up to 20% less power
at the DIMM level with no performance penalty. In addition, the industry supports UDIMM at 2 DIMMs per
channel at 1066 MT/s. HP SmartMemory supports 2 DIMMs per channel at 1333 MT/s, or 25% greater
bandwidth.
Memory subsystem architecture
The memory subsystem in this server blade is divided into channels. Each processor supports four channels,
and each channel supports two DIMM slots, as shown in the following table.