Lenovo System x3550 M5, Installation And Service Manual

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Step 4. Remove the air baffle (see “Removing the air baffle” on page 122).
Step 5. Carefully open the retaining clips on each end of the DIMM connector and remove the DIMM.
Attention: To avoid breaking the retaining clips or damaging the DIMM connectors, open and
close the clips gently.
Alignment
slot
DIMM
Alignment tab
Retaining
clip
Figure 85. DIMM removal
If you are instructed to return the DIMM, follow all packaging instructions, and use any packaging materials
for shipping that are supplied to you.
Memory module installation
The following notes describe the types of DIMMs that the server supports and other information that you
must consider when you install DIMMs.
• When you install or remove DIMMs, the server configuration information changes. When you restart the
server, the system displays a message that indicates that the memory configuration has changed.
• The server supports only industry-standard double-data-rate 4 (DDR4) 2400 MHz PC4-19200 registered
or load reduction, synchronous dynamic random-access memory (SDRAM) dual inline memory modules
(DIMMs) with error correcting code (ECC). See http://www.lenovo.com/ serverproven/ for a list of
supported memory modules for the server.
– The specifications of a DDR4 DIMM are on a label on the DIMM, in the following format. gggggeRxff
PC3 v - wwwwwm - aa - bb - ccd
where:
– ggggg is the total capacity of the DIMM (for example, 1 GB, 2 GB, or 4 GB)
– eR is the number of ranks
1R = single-rank
2R = dual-rank
4R = quad-rank
– xff is the device organization (bit width)
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Lenovo System x3550 M5 Installation and Service Guide