Sony PCG-GR390K - Manual (Page 95)

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Adding Memory
In the future you may want to install memory modules to expand the
functionality of your notebook. The amount of memory on your notebook
will vary depending on the model you purchased. See the Specifications
flyer that came with your notebook for the amount of memory pre-
installed. Expansion memory modules are available as options. For
memory upgrades, use only unbuffered PC133 (CL2) SDRAM SO-DIMMs
(gold lead contacts). This section describes how to replace memory
modules in your computer:
❑ Precautions and Procedures
❑ Typical expansion memory configuration
❑ Removing a memory module
❑ Installing a memory module
❑ Viewing the amount of memory