From the model number you were asking about it says that it takes pc2700 ddr333 RAM It has 256MB standard and is upgradable to 1GB between the two sockets for RAM. Thanks
I found an online manual for the PCV 7744 and it is NOT upgradable to 1GB, only to two 256 MB sticks for a total of 512 MB RAM maximum. Here is the link, you will need to scroll down near the end to page 72 to get this information.
http://www.manualowl.com/m/Sony/PCV-RX640/Manual/62418?page=5
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