What exactly is the difference between GT 555M and GTX 570M

I’m planning on buying a new mobile computer, one of them with GTX 570M; that computer costs significantly more. I am aware that the GTX is WAY better than the GT, though, to what extent? What will exactly be the difference between 2 GB GT 555M and 1.5 GB GTX 570M? Will it be noticeable on heavy games, such as Black Ops, Battlefield 3? Will they run smoothly on at least High graphics? (i7 2670QM, 8 GB RAM)

Hi

Quick research on Google suggests some users are having issue running BF3 on the GT 555M! So I think the 570M would be a better good choice and you should be able to play with the setting on high.

Ref;

NVIDIA GeForce GT 555M - NotebookCheck.net Tech
NVIDIA GeForce GTX 570M - NotebookCheck.net Tech