I was wondering if getting a graphics card with extra memory such as a NVidia 770 standered 2gb memory but would it be at all beneficial to pay the extra and get 4gb memory on the card? or in the case of a radeon 280x standered ram is 3gb would it be overkill to get the new one by msi that has 6gb of memory? in what situations whould all the extra memory be beneficial?