HP ProLiant DL385p Gen8 Server - Manual (Page 53)

Hardware options installation 53
The memory subsystem in this server can support LRDIMMs or RDIMMs:
• RDIMMs offer lower latency in one DIMM per channel configurations and (relatively) low power
consumption. They 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.
All types are referred to as DIMMs when the information applies to all types. When specified as LRDIMM or
RDIMM, 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 (DDR-1333) RDIMMs operating at up to 1333 MT/s
• Single- and dual-rank PC3-12800 (DDR-1600) RDIMMs operating at up to 1600 MT/s
• Quad-rank PC3L-10600 (DDR3-1333) LRDIMMs, operating as dual-rank DIMMs, at up to 1333 MT/s
Speed, voltage, and capacity
DIMM type DIMM capacity DIMM rank Native speed (MT/s) Voltage
RDIMM 4 GB Single-rank 1600 STD 1.5 V
RDIMM
4 GB Single-rank 1333 LV 1.35 V
RDIMM 4 GB Single-rank 1333 ULV 1.25 V
RDIMM 8 GB Single-rank 1600 STD 1.5 V
RDIMM 8 GB Dual-rank 1333 LV 1.35 V
RDIMM 8 GB Dual-rank 1333 ULV 1.25 V
RDIMM 16 GB Dual-rank 1600 STD 1.5 V
RDIMM 16 GB Dual-rank 1333 LV 1.35 V
LRDIMM 32 GB Quad-rank 1333 LV 1.35 V
Depending on the processor model, the number of DIMMs installed, and the voltage(s) of the DIMMs
installed, the memory clock speed can be reduced from the DIMMs' native speed. See the following tables
for details.
Populated DIMM speed (MT/s), RDIMM
Memory
modules
per
channel
Single-rank
or
Dual-rank
Memory module
native speed Memory bus
speed (standard
voltage memory
module)
Memory bus
speed (low
voltage memory
module)
Memory bus
speed (ultra low
voltage memory
module)
1 1 1600 MHz 1600 MHz 1333 MHz 1333 MHz
1 1 1333 MHz 1333 MHz 1333 MHz 1333 MHz
2 2 Single-rank 1600 MHz
1333 MHz
1333 MHz 1333 MHz 1333 MHz
2 2 Dual-rank 1600 MHz
1333 MHz
1333 MHz 1333 MHz 1066 MHz
2 2 mixed 1600 MHz
1333 MHz
1333MHz 1333 MHz 1066 MHz
3 3 Single-rank 1600 MHz
1333 MHz
1066 MHz 1066 MHz 800 MHz
3 3 Dual-rank 1600 MHz
1333 MHz
1066 MHz 800 MHz 667 MHz