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Removal and replacement procedures 63
• QR memory modules must be installed only in memory sockets 2, 5, 8, and 11, while following the
population order for those memory sockets.
Processor
memory
socket
1 2 3 4 5 6
Rank support
per memory
socket
SR/DR SR/DR/QR SR/DR SR/DR SR/DR/QR SR/DR
Population
order
A I E C K G
Processor
memory
channel
A A A B B B
Processor
memory
socket
7 8 9 10 11 12
Rank support
per memory
socket
SR/DR SR/DR/QR SR/DR SR/DR SR/DR/QR SR/DR
Population
order
B J F D L H
Processor
memory
channel
C C C D D D
Population rules
When installing memory modules, observe the following population rules:
• Use only HP memory modules listed in the DL385 QuickSpecs.
• Advanced ECC is not available if x4 and x8 memory modules are mixed in channels (A and B), (C and
D), or both, but standard ECC is still available. Advanced ECC is available if x4 and x8 memory
modules are mixed in memory channels (A and C), (B and D), or both.
• No more than two UDIMMs may be installed per channel.
• Do not mix UDIMMs and RDIMMs within this server.
Population guidelines
While adhering to the memory population rules ("Population rules" on page 63), performance can be
improved by following the guidelines below:
• Memory modules may be installed one at a time per processor, but installing two at a time per processor
provides for additional performance, installing four at a time per processor provides for better