RAM Upgrade and Gaming

i have macbook: http://support.apple.com/kb/sp584
1.) upgrading ram (i have 2gb) boost gaming performance? if upgrade 4gb? plan on playing gw2 (min req:http://www.guildwarsinsider.com/guild-wars-2-minimum-system-requirements/)
2.) kind of ram need get? , where?

thank you!

 

more ram better.

http://eshop.macsales.com/shop/memory/apple_macbook_macbook_pro/upgrade/ddr3

 

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