IBM System x3755 M3 7164 Installation And User Manual page 80

v Do not install registered and unbuffered DIMMs in the same server.
v When you install additional DIMMs on the server, be sure to install them in pairs.
v You do not have to save new configuration information to the iBMC when you
v When you restart the server after you add or remove a DIMM, the server
v Non-sparing (normal) mode: When you use the non-sparing mode, install
v Online-spare mode: The memory online-spare feature disables the failed DIMM
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IBM System x3755 M3 Type 7164: Installation and User's Guide
Table 3. DIMM speed (continued)
DIMMs in
each channel DIMM type
2 Single-rank, dual-rank
Quad-rank, single-rank/dual-rank
Quad-rank
The DIMMs in each pair must match each other.
install or remove DIMMs. The only exception is if you replace a DIMM that was
designated as disabled in the Setup utility Memory Settings menu. In this case,
you must re-enable the row in the Setup utility or reload the default memory
settings.
displays a message that the memory configuration has changed.
DIMMs as indicated in the following tables.
The following table lists the DIMM installation sequence (per pair) for non-sparing
mode when two or four microprocessors are installed in the server.
Table 4. Non-sparing mode memory installation sequence (in pairs)
Number of microprocessors
2
4
from the system configuration and activates an online-spare DIMM to replace the
failed active DIMM. You can enable online-spare memory in the Setup utility (see
"Setup utility menu choices" on page 76). When you use the memory
online-spare feature, consider the following information:
– The memory online-spare feature does not support quad-rank DIMMs.
– When you enable the memory online-spare feature, you must install a pair of
DIMMs per microprocessor at a time. The DIMMs must be identical in rank
and speed.
– The maximum available memory is reduced to one-half of the installed
memory when two single-rank DIMMs are used. The maximum available
memory is reduced to one-third of the installed memory when one single-rank
DIMM and one dual-rank DIMM are used.
– You must install at least two DIMMs for each microprocessor in the server
before you use the internal flash memory for VMware.
– The following table lists the DIMM installation sequence for online-spare mode
when two or four microprocessors are installed in the server.
DIMM speed
1.5 V 1.35 V
1333 1333
1066 800
1066 800
DIMM connectors
1, 9, 5, 13, 3, 7, 11, 15, 2, 6, 10, 14, 4, 8,
12, 16
1, 9, 17, 25, 5, 13, 21, 29, 3, 7, 11, 15, 19,
23, 27, 31, 2, 6, 10, 14, 18, 22, 26, 30, 4, 8,
12, 16, 20, 24, 28, 32