Table 10. RDIMM population rule for dual-channel symmetric mode (continued)
DIMM
connector 1
DIMM
connector 2
DIMM
connector 3
DIMM
connector 4
DIMM
connector 5
DIMM
connector 6
Populated Populated Empty Populated Populated Empty
Populated Populated Populated Populated Populated Populated
The following illustration shows the location of the DIMM connectors on the system
board.
DIMM 1
DIMM 2
DIMM 3
DIMM 4
DIMM 5
DIMM 6
Microprocessor
Heatsink
Orientation
DIMMs
DIMMs
Attention: Static electricity that is released to internal server components when
the server is powered on might cause the server to halt, which might result in the
loss of data. To avoid this potential problem, always use an electrostatic-discharge
wrist strap or other grounding system when you work inside the server with the
power on.
To install a DIMM, complete the following steps:
1. Read the safety information that begins on page vii and “Installation guidelines”
on page 27.
2. Turn off the server and peripheral devices and disconnect the power cords and
all external cables, if necessary.
3. Remove the cover (see “Removing the cover” on page 29).
4. Remove the DIMM air baffle.
5. Locate the DIMM connectors on the system board. Determine the connectors
into which you will install the DIMMs. Install the DIMMs in the sequence shown
in the following table.
Table 11. DIMM installation sequence
Number of DIMMs Installation sequence (connectors)
First pair of DIMMs 1, 4
Second pair of DIMMs 2, 5
Third pair of DIMMs 3, 6
34 IBM System x3250 M3 Types 4251, 4252, and 4261: Installation and User’s Guide
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