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Hardware options installation 45
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For rack models, if removed, install the security bezel (on page 22).
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 LRDIMMs, 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.
• 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,
RDIMM, or UDIMM, 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
• Single- and dual-rank PC3-10600 (DDR-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
Speed, voltage, and capacity
DIMM type DIMM rank DIMM capacity Native speed (MT/s) Voltage
RDIMM
Dual-rank 8GB 1333 LV
RDIMM
Single-rank 8GB 1600 STD
RDIMM
Dual-rank 16GB 1333 LV
LRDIMM
Quad-rank 32GB 1333 LV
UDIMM
Dual-rank 8GB 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. 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
—
3 DIMMs per
channel
—
— — 1.35V 1.5V 1.35V 1.5V 1.35V 1.5V
RDIMM
Dual-rank (8GB) 1333 1600 1333 1600 1066* 1066
RDIMM
Single-rank (8GB) 1333 1600 1333 1600 1066 1066
RDIMM
Dual-rank (16GB) 1333 1600 1333 1600 1066* 1066
LRDIMM
Quad-rank
(32GB)
1333** 1333 1333** 1333 1066 1066