Hardware options installation 53
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For rack models, if removed, install the security bezel (on page 21).
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 PC3-12800 (DDR-1600) RDIMMs operating at up to 1600 MT/s
• Single- and dual-rank PC3-14900 (DDR-1866) RDIMMs operating at up to 1866 MT/s
• Single- and dual-rank PC3-14900 (DDR-1866) UDIMMs operating at up to 1866 MT/s
• Quad-rank PC3L-14900 (DDR3-1866) LRDIMMs, operating as dual-rank DIMMs, at up to 1866 MT/s
Speed, voltage, and capacity
DIMM type DIMM rank DIMM capacity Native speed (MT/s) Voltage
RDIMM
Single-rank 4 GB 1600 LV
RDIMM
Single-rank 4 GB 1866 STD
RDIMM
Dual-rank 8 GB 1600 LV
RDIMM
Single-rank 8 GB 1866 STD
RDIMM
Single-rank 8 GB 1600 LV
RDIMM
Dual-rank 16 GB 1600 LV
RDIMM
Dual-rank 8 GB 1866 LV
RDIMM
Dual-rank 16 GB 1866 STD
LRDIMM
Quad-rank 32 GB 1866 STD
UDIMM
Single-rank 2 GB 1600 LV
UDIMM
Dual-rank 4 GB 1600 LV
UDIMM
Dual-rank 8 GB 1600 LV
UDIMM
Single-rank 2 GB 1866 STD
UDIMM
Dual-rank 4 GB 1866 STD
UDIMM
Dual-rank 8 GB 1866 STD
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 1866 or 1600 MT/s. Clock speed can
also be reduced when using low voltage DIMMs.
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