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Hardware options installation 54
Memory options
IMPORTANT: This server does not support mixing LRDIMMs, RDIMMs, or UDIMMs. 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 RDIMMs or UDIMMs:
• 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 (DDR-1333) RDIMMs operating at up to 1333 MT/s
• Single-rank and dual-rank PC3-12800 (DDR-1600) RDIMMs operating at up to 1600 MT/s
• Single-rank and dual-rank PC3-10600 (DDR-1333) UDIMMs operating at up to 1333 MT/s
Speed, voltage, and capacity
DIMM type DIMM rank DIMM capacity Native speed (MT/s) Voltage
RDIMM
Dual 8 GB 1333 LV
RDIMM
Single 8 GB 1600 STD
RDIMM
Dual 16 GB 1333 LV
UDIMM
Dual 8 GB 1333 LV
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 DIMM rank 1 DIMM
per
channel
— 2 DIMMs per
channel
—
— — 1.35V 1.5V 1.35V 1.5V
RDIMM
Dual rank (8GB) 1333 n/a 1333 n/a
RDIMM
Single rank (8
GB)
n/a 1600 n/a 1600
RDIMM
Dual rank (16 GB)
1333
n/a
1333
n/a
UDIMM
Dual rank (8 GB) 1333 n/a 1333* n/a
* UDIMM is supported at 2DPC at 1333 using HP SmartMemory only. Third-party memory supports up to 2DPC at 1066.
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.