Population Rules; Population Guidelines; Memory Bus Speed - HP ProLiant DL385 G7 Maintenance And Service Manual

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
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.

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:
Within RBSU, select the Power Management Options menu > Advanced Power Management Options
1.
menu > Maximum Memory Bus Frequency menu.
Select one of the following menu options:
2.
Auto (default)—The memory bus speed is set to what is shown in the following table. If the native
o
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
1
1
2
2
QR SR or DR Memory
module native
speed
— 1* SR 1333 MHz
DR 1333 MHz
DR 1066 MHz
1 — QR 1066 MHz
— 2* SR 1333 MHz
DR 1333 MHz
DR 1066 MHz
1 1 SR 1333 MHz
DR 1333 MHz
DR 1066 MHz
("Population rules" on page 64), performance can be
Memory bus speed
(standard-voltage
memory module)
1333 MHz
1066 MHz
1333 MHz
800 MHz
Removal and replacement procedures 64
Memory bus speed
(low-voltage memory
module)
1333 MHz
1066 MHz
1333 MHz
800 MHz