Vaio notebook ram

Hi, I have a Vaio AW 21xy/q with two memory slots and 4gig ram, can I upgrade to 2 x 4 gig and is there any special requirement for ram this notebook
Thanks.?

Welcome to CDFreaks…

What OS are you running?

How much memory your Windows OS will recognize depends on which version of Windows you are running. 32-bit versions of Windows will see (and utilize) only 3GB or 3.5GB. To utilize more memory, install a 64-bit version of your OS. More information about OS memory maximums can be found at http://www.crucial.com/kb/answer.aspx?qid=4251.

Try the scan at
http://www.crucial.com/store/drammemory.aspx?AID=5032654&PID=275357