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Hello, i need to upgrade my RAM memory, but i don't know the list of compalibility. Where can I buy this? There are generalist memories?
Hi Tupacsoul
According to the specs your FS415S uses DDR2 533mhz So-Dimm modules
Have a look at Cruical.com several members have bought extra RAM from crucial and another benefit from buying from Crucial is there memory compatibility guarantee. 
Also you may find this guide, from Sony, on how to upgrade your Vaio's memory of interest.. 
hello, i have the same dilema
i want to upgrade my fe21B ram
i currently have 1 gb (2*512)
and i want to upgrade with crucial modules
2*1024
but the thing is that i have 533MHZ and if i check compatible modules both in crucial.com and here in sony s webstore, it saays modules with 667mhz
does anyone know if i will have compatability problems, if i buy 667mhz modules instead of 533 that i currently own?
Hi basiliszag,
667mhz modules are backwardly compatible so you should not encounter any problems.
nice! thanx a lot mate
You're welcome basiliszag, let us know how the upgrade goes... 
You're welcome basiliszag, let us know how the upgrade goes...