Dell Precision WorkStation 420 Memory Upgrade Procedure page 11

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If a RIMM is already installed in the socket you want to use, you must remove it. For
instructions, see "Removing a RIMM" on page 1-8.
To install a RIMM, perform the following steps (see Figure 1-2).
1. Locate the plastic securing clips at each end of the socket. Press the clips out-
ward until they snap open.

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2. Press the RIMM straight into the socket until the securing tabs snap into place
around the ends of the RIMM.
notches (2)
securing
clips (2)

  
System Memory Upgrade 1-7