Typical Expansion Memory Configuration - Sony VAIO PCG-R505JL User Manual

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Electrostatic discharge (ESD) can damage disk drives and other components.
Perform the procedures described below only at an ESD workstation. If such
a station is not available, do not work in a carpeted area, and do not handle
materials that produce or hold static electricity (cellophane wrappers, for
example). Ground yourself by maintaining contact with an unpainted metal
portion of the chassis while performing the procedure.
Do not open the memory module package until you are ready to install the
module. The package protects the module from ESD.
Use the special bag for preventing ESD or use aluminum foil when you store
the memory module.

Typical expansion memory configuration

Total System Memory (MB) On board (MB)
128
192
256
384
86
128
128
128
128
Slot (MB)
64
128
256