Memory Options - HP ProLiant BL420c User Manual

CAUTION:
pattern).
Install the heatsink.
14.
Install the SAS controller (on page 15).
15.
Install the access panel (on page 14).
16.
Install the server blade
17.

Memory options

IMPORTANT:
Attempting to mix any combination of these DIMMs can cause the server to halt during BIOS
initialization.
The memory subsystem in this server blade 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 blade 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
Heatsink retaining screws should be tightened in diagonally opposite pairs (in an "X"
("Installing a server
This server blade does not support mixing LRDIMMs, RDIMMs, or UDIMMs.
blade" on page 21).
Hardware options installation 28