Lenovo System x3650 M4 HD, Installation And Service Manual

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You can enable rank sparing memory in the Setup utility, select System Settings ➙ Memory . For more
information, see “Using the Setup utility” on page 103.
The maximum available memory is reduced when memory rank sparing mode is enabled.
The following diagram lists the DIMM connectors on each memory channel.
Figure 33. Connectors on each memory channel
Follow the installation sequence for rank sparing mode:
• Install at least one quad-rank DIMM in a channel.
• Install at least two single-rank or dual-rank DIMMs in a channel.
Table 9. Memory rank sparing mode DIMM population sequence
Number of DIMMs
Number of installed
microprocessor
DIMM connector
First pair of DIMMs 1 1, 2
Second pair of DIMMs 1 4, 5
Third pair of DIMMs 1 8, 9
Fourth pair of DIMMs 1 11, 12
Fifth pair of DIMMs 1 7, 10
Sixth pair of DIMMs 1 3, 6
Seventh pair of DIMMs
2 13, 14
Eighth pair of DIMMs 2 16, 17
Ninth pair of DIMMs 2 20, 21
Tenth pair of DIMMs 2 23, 24
Eleventh pair of DIMMs 2 19, 22
Twelfth pair of DIMMs 2 15, 18
Note: DIMM connectors 3, 6, 7, 10, 15, 18, 19, and 22 are not used in memory rank sparing mode when UDIMMs
are installed in the server.
Installing a memory module
Use this information to install a memory module.
Step 1. Read the safety information that begins on “Safety” on page v and “Installation guidelines”
on page 34.
Step 2. Turn off the server and peripheral devices and disconnect the power cords and all external cables,
if necessary.
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Lenovo System x3650 M4 HD Installation and Service Guide