Can a Sony VAIO PCV-RX550 handle two 512mb memory cards?

A friend has a 10 year old Sony and would like to load Windows 7 (currently XP).  Windows 7 needs 1gb of memory.  Can they put two 512mb memory boards?  Sony says no but we want to know what the experts say.  Thanks.
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As far as I can tell, 512MB max is the limit.

For what it is worth though, I have W7 running on an old Athlon 1333 (socketA) with 512MB of PC-133 ram, and onboard video.
I can't do any "heavy lifting" with it (W7 takes about 256MB), but it works fine for browsing and general "lite" work loads.

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on this page, they say it's limited to 512 MB
but you can try if a 512 MB stick is recognised, and runs with memtest :
Thank you much.    : )
i would like to know if a 512 Mb one was tried - and worked?
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