Lenovo System x3250 M4, Installation And Service Manual

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• The following table lists the maximum DIMM population using ranked UDIMMs.
Table 32. Maximum memory population using ranked UDIMMs (depending on your model)
Number of UDIMMs DIMM type Size Total memory
4
Single-rank UDIMMs 1 GB 4 GB
4 Dual-rank UDIMMs 2 GB 8 GB
4 Dual-rank UDIMMs 4 GB 16 GB
4 Dual-rank UDIMMs 8 GB 32 GB
• The following table shows the UDIMM memory population rule to optimize the system performance.
Table 33. UDIMM population rule
DIMM connector 1 DIMM connector 2 DIMM connector 3 DIMM connector 4
Populated Empty Empty Empty
Populated Empty Populated Empty
Populated Populated Populated Populated
Installing a DIMM
Use this information to install a DIMM.
Read the safety information in “Safety” on page v and “Installation guidelines” on page 33.
If you are replacing a server component in the server, you need to turn off the server and peripheral devices,
and disconnect the power cords and all external cables.
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.
The following illustration shows the location of the DIMM connectors on the system board.
Chapter 6
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Removing and replacing components
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