Which Ram should I buy for my all-in-one desktop?

I want upgrade my ram to 6GB from 2GB,so i want to know whick ram should i buy and will work in my PC

Lenovo IdeaCenter B320 is the model name

I have DDR3 2GB ram having:-
Max bandwidth -PC3-10700 (667 MHz)
Nominal Voltage 1.50 Volts

CPU-Z report File is here:-https://drive.google.com/file/d/0By-PyodA2-iBNjlaYlp6Q0JxMWM/view?usp=sharing

Please suggest me few names of ram that i should buy.

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