Lenovo H30 Series User Manual page 52

For Lenovo H30-05 and H30-50 refer to the below instructions:
3. Remove the memory module being replaced by opening the retaining clips as
shown.
4. Position the new memory module over the memory connector. Make sure
the notch on the memory module is correctly aligned with the connector
key on the system board. Push the memory module straight down into the
connector until the retaining clips close.
5. Refer to "Completing the installation".
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User Guide