DIMM installation sequence
Depending on the server model, the server may come with a minimum of one 2
GB or 4 GB DIMM installed in slot 1. When you install additional DIMMs, install
them in the order shown in the following table to optimize system performance.
In general, all three channels on the memory interface for each microprocessor can
be populated in any order and have no matching requirements.
Table 5. Independent mode DIMM installation sequence
Number of installed
microprocessor
DIMM connector population sequence
One microprocessor installed
1, 4, 9, 12, 2, 5, 8, 11, 10, 7, 6, 3
Two microprocessors installed
1, 13, 4, 16, 9, 21, 12, 24, 2, 14, 5, 17, 8, 20, 11, 23, 22, 10, 19, 7, 18, 6, 15, 3
Memory mirrored channel
Memory mirrored channel mode replicates and stores data on two pairs of DIMMs
within two channels simultaneously. If a failure occurs, the memory controller
switches from the primary pair of memory DIMMs to the backup pair of DIMMs.
You can enable memory mirrored in the Setup utility (see “Starting the Setup
utility” on page 106).
When you use the memory mirrored channel feature, consider the following
information:
v
When you use memory mirrored channel, you must install a pair of DIMMs at a
time. The two DIMMs in each pair must be identical in size, type, and rank
(single, dual, or quad), and organization, but not in speed. The channels run at
the speed of the slowest DIMM in any of the channels.
v
The maximum available memory is reduced to half of the installed memory
when memory mirrored is enabled. For example, if you install 64 GB of memory
using RDIMMs, only 32 GB of addressable memory is available when you use
memory mirrored channel.
The following diagram lists the DIMM connectors on each memory channel.
Figure 25. Connectors on each memory channel
Chapter 2. Installing optional devices
63
Summary of Contents for 7383
Page 1: ...System x3500 M4 Type 7383 Installation and Service Guide ...
Page 2: ......
Page 3: ...System x3500 M4 Type 7383 Installation and Service Guide ...
Page 8: ...vi System x3500 M4 Type 7383 Installation and Service Guide ...
Page 42: ...24 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 200: ...182 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 360: ...342 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 416: ...398 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 470: ...452 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 479: ...Taiwan Class A compliance statement Notices 461 ...
Page 480: ...462 System x3500 M4 Type 7383 Installation and Service Guide ...
Page 487: ......
Page 488: ... Part Number 46W8192 Printed in USA 1P P N 46W8192 ...