Lenovo ThinkStation P720 Hardware Maintenance Manual page 182

7. To remove the memory module, open the retaining clips and gently pull the memory module out of the
memory slot.
Figure 140. Removing a memory module
8. To install a memory module, do the following:
a. Open the retaining clips of the memory slot into which you want to install the memory module.
Figure 141. Opening the retaining clips
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P720 Hardware Maintenance Manual