Hello i was wondering if i get a evga 660 SC 2gb http://www.newegg.com/Product/Product.aspx?Item=N82E16814130826 and a EVGA SC 3gb http://www.newegg.com/Product/Product.aspx?Item=N82E16814130835 would the 3gb one use its 3gigs or will it just drop down to math the 2gig version of the card?