Sony PCG-GR390K - Manual (Page 97)

Typical expansion memory configuration
97
Typical expansion memory configuration
Models with 256 MB memory
*
* The 384 MB and 512 MB memory configurations may require the removal and replacement
of original factory-installed memory modules.
Total System Memory
(MB) Slot 1
(MB) Slot 2
(MB)
256 256
384 256 128
512 256 256