Originally Posted by luthier

CoD usually sits at around 1.8 Gigs in the memory. I don't think I've ever seen it go anywhere near 3 gigs.

Originally Posted by Oleg Maddox

but you need more than 4 [GB] to escape the one of the types of shuttering.
As Ilya already told - huge space with good resolution terraine need more memory both graphics card and PC itself.