Lenovo Nvidia GT555 1GB VS Nvidia 2GB

Hy all,I want to buy Lenovo Ideapad Y570 but I don`t know what model I should buy
first model:Lenovo IdeaPad Y570 (Intel Core i7-2670QM, 15.6", 6GB, 750GB, nVidia GeForce GT 555M 2GB)
second: Lenovo IdeaPad Y570 (Intel Core i7-2670QM, 15.6", 4GB, 750GB, nVidia GeForce GT 555M 1GB)out

I don`t know much about laptops,but I don`t want to make a mistake about my choice.
It the gt555 2gb better then 1gb or is the same but is diffrent only video memory?
Thx,I wait your answare.
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  1. The cheaper one.
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