looking for RAM Upgrade for Lenovo B460

[TubbyStubby2]

hi, I have a Lenovo b460 with 1GB ram pre-installed and it works like a snail (or sloth, as you like it) so I wanted to upgrade my ram. one of the ram slot is free so can you suggest a ram for my laptop.
by the way I live in India and I found this "Corsair CM3X2GSD1066 2GB DDR3 SODIMM Single Memory Module" on amazon so will this work.
and I also wanted to know whether I can use it with my current ram.

 

[TubbyStubby2]

MERGED QUESTION
Question from TubbyStubby2 : "Help Needed to buy Ram For lenovo b460"

hey I have a Lenovo b460 with 1GB Ram installed and it works like a snail. I wanted a suggestion for ram's compatible with my laptop. also wanted to ask that whether I can install them both (as I have two memory slots, one is empty and one is 1GB). I m new to these hardware things so not know what iformation to provide.also I live in india and found this on amazon "Corsair CM3X2GSD1066 2GB DDR3 SODIMM Single Memory Module" so can I use this in my laptop alongside the 1GB ram. thanks for answer.