Sony PCG-VX89 VAIO User Guide (primary manual) User Manual page 152

VAIO Computer Quick Start
Installing a New Memory Module
14 Snap the connectors into place when the board is correctly seated.
15 Close the computer cover and replace the fastening screws on the bottom of
the computer.
16 Make sure the system memory matches the amount of installed memory. See
"Confirming added memory capacity."
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M e m o r y m o d u l e