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HP ProLiant DL385 G7 Server - Configuring Memory

Overview

HP ProLiant DL385 G7 server supports 2 GB to 256 GB of system memory using DDR3 2-GB, 4-GB, 8-GB, and 16-GB memory modules across 24 memory sockets.

DIMM slots are identified by the numbers 1 through 12.

Figure 1: DIMM slots

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Advanced ECC memory

Advanced ECC memory is the memory protection mode for this server. In Advanced ECC, the server does not fail because of correctable memory errors. The server provides notification if the level of correctable errors exceeds a pre-defined threshold rate.

Advanced ECC provides additional protection over standard ECC because it is possible to correct certain memory errors that would otherwise be uncorrectable and result in a server failure.

Whereas standard ECC can correct single-bit memory errors, Advanced ECC can correct single-bit memory errors and multi-bit memory errors if all failed bits are on the same DRAM device on the memory module.

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Population order

The two tables below represent the memory module population order for one processor. The population order for the other processor is identical. SR denotes Single Rank, DR denotes Dual Rank, and QR denotes Quad Rank.

All memory modules must follow the population order shown in these two tables for both processors with the following exception:

NOTE: 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/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

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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.

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Population guidelines

While adhering to the memory population rules, 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 performance, and installing equal amounts of memory for both processors provides for best performance.

  • Install all memory modules of the same speed on the same processor for best performance.

  • Install all memory modules of the same voltage on the same processor for best power.

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Memory bus speed

Depending on the quantity and native speed of memory modules installed, memory bus speeds can be 1333 MHz, 1066 MHz, 800 MHz, or 667 MHz. Memory bus speeds can be different for each processor.

To determine memory bus speeds, do the following:

  1. Within RBSU, select the Power Management Options menu > Advanced Power Management Options menu > Maximum Memory Bus Frequency menu.

  2. Select one of the following menu options:

    • Auto (default) - The memory bus speed is set to what is shown in the following table. If the native speed of the installed memory module is slower than the memory bus speed, the memory bus speed is set to the memory module native speed

      Memory modules per channel
      QR
      SR or DR
      Memory module native speed
      Memory bus speed (standard-voltage memory module)
      Memory bus speed (low-voltage memory module)
      1
      1
      SR 1333 MHz
      DR 1333 MHz
      DR 1066 MHz
      1333 MHz
      1333 MHz
      1
      1
      QR 1066 MHz
      1066 MHz
      1066 MHz
      2
      2
      SR 1333 MHz
      DR 1333 MHz
      DR 1066 MHz
      1333 MHz
      1333 MHz
      2
      1
      1
      SR 1333 MHz
      DR 1333 MHz
      DR 1066 MHz
      QR 1066 MHz
      800 MHz
      800 MHz
      3
      3 SR
      SR 1333 MHz
      1333 MHz
      1066 MHz
      3
      3 DR
      DR 1333 MHz
      DR 1066 MHz
      1066 MHz
      800 MHz
      3
      3 mixed
      SR 1333 MHz
      DR 1333 MHz
      DR 1066 MHz
      1066 MHz
      800 MHz
      3
      1
      2
      SR 1333 MHz
      DR 1333 MHz
      DR 1066 MHz
      QR 1066 MHz
      800 MHz
      667 MHz
    • 800 MHz - The memory bus speed is set to 800 MHz regardless of the quantity of memory modules installed, unless the table above reflects a slower memory bus speed.

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Legal Disclaimer: Products sold prior to the November 1, 2015 separation of Hewlett-Packard Company into Hewlett Packard Enterprise Company and HP Inc. may have older product names and model numbers that differ from current models.

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Document title: HP ProLiant DL385 G7 Server - Configuring Memory
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