The Vaio model originally shipped with a pair of 256mb dimms totally 512. The details seen there show: 512MB PC-3200 400MHz DDR (256MB x 2) (Expandable to 2.0GB)
The expandable to 2gb applies to seeing all dimm slots populated with the largest dimm you can use being four 512s to reach the total 2gb total. The board doesn't support 1gb dimms as typically seen with many older systems and on boards for custom builds as well.
Many saw 3gb as the max once boards came out supporting 1gb dimms were 3 could be used for the max. If you look at the latest boards now seen you now see 8gb and 16gb max capacities since the introuction of 2gb dimms. What happened there for you however is you simply went with dimms too large for use on the older model.
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