Hi varun_sh,
Welcome to Sony Community!
In addition to what legendster provided here, kindly check out this link for more information about your laptop. Based on the specs it shows that the maximum RAM is 8GB and they are 2 slots.
For further assistance regarding your concern, please contact the Sony offices/Sony representative offices nearest to your place of residence in Asia Pacific region http://www.sony-asia.com/countryselector.html?hpid=countryselector:AsiaPacific. Due to proximity, they are in a better position to respond to your questions or concerns.
I hope this helps.
Regards,
Jen
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