HP ProLiant BL460c Gen8 Server Blade - Manual (Page 28)

Hardware options installation 28
• Three-rank PC3-12800 (DDR-1600) RDIMMs operating at up to 1333 MT/s
• 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
RDIMM Three-rank 24 GB 1333 LV
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
RDIMM Three-rank (24 GB) — 1333*
LRDIMM Quad-rank (32 GB) 1333 1333
UDIMM Dual-rank (8 GB) 1333 1333**
* Three rank DIMMs are supported in a full configuration of 16 three-rank RDIMMs only.
** 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.