Opening The Retaining Clips; Removing A Memory Module; Installing The Memory Module - Lenovo ThinkStation 4155 Hardware Installation And Replacement Manual

5. Open the retaining clips as shown.
Figure 25. Opening the retaining clips
Figure 26. Removing a memory module
6. Position the new memory module over the memory slot. Make sure the notch
Figure 27. Installing the memory module
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Hardware Installation and Replacement Guide
If you are replacing an old memory module, open the retaining clips and
remove the memory module being replaced as shown.
▌1▐ on the memory module aligns correctly with the slot key ▌2▐ on the system
board. Push the memory module straight down into the slot until the retaining
clips close.