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Hardware options installation 49
Memory options
IMPORTANT: This server does not support mixing LRDIMMs, RDIMMs, UDIMMs, or HDIMMs.
Attempting to mix any combination of these DIMMs can cause the server to halt during BIOS
initialization.
The memory subsystem in this server can support LRDIMMs, RDIMMs, UDIMMs, or HDIMMs:
• 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.
• LRDIMMs support higher densities than single- and dual-rank RDIMMs, and higher speeds than
quad-rank RDIMMs. This support enables you to install more high capacity DIMMs, resulting in higher
system capacities and higher bandwidth.
• HDIMMs provide faster speeds than other DIMMs. 12 DIMMs per processor are required with
HDIMMs.
All types are referred to as DIMMs when the information applies to all types. When specified as LRDIMM,
RDIMM, UDIMM, or HDIMM, the information applies to that type only. All memory installed in the server must
be the same type.
The server supports the following DIMM speeds:
• Single- and dual-rank PC3-10600 (DDR3-1333) RDIMMs operating at up to 1333 MT/s
• Single- and dual-rank PC3-12800 (DDR3-1600) RDIMMs operating at up to 1600 MT/s
• Single- and dual-rank PC3-14900 (DDR3-1866) RDIMMs operating at up to 1866 MT/s
• Single- and dual-rank PC3-10600 (DDR3-1333) UDIMMs operating at up to 1333 MT/s
• Quad-rank PC3L-10600 (DDR3-1333) LRDIMMs, operating as dual-rank DIMMs, at up to 1333 MT/s
• Quad-rank PC3L-14900 (DDR3-1866) LRDIMMs operating as dual-rank DIMMs at up to 1866 MT/s
For the latest memory configuration information, see the product QuickSpecs on the HP Product Bulletin
website (http://www.hp.com/go/productbulletin).
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, this Gen8 server supports DDR3-1333 RDIMM up
to 3 DIMMs per channel at 1066 MT/s running at 1.35V. 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.