Hi redentor,
Welcome to Sony Community!
The maximum RAM that you can put on this laptop is 8GB (4GBx2), the Type/Speed should be DDR3/1066MHz. Click here for more information about the specification of your device.
We kindly recommend visiting our Sony Global Web site for information on contacting the Sony Support Center in your region at http://www.sony.net/SonyInfo/Support/.
Regards,
Jen
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