i currently have a gtx 560 ti 1gb and battlefield 3 is just scoffing my memory... i dont have a clue how sli works with memory so is it better for me to get another 1gb or 2 2gb or add in a 2gb card
Exactly. Sell your current card, get a 670, and enjoy the smoothness. I have noticed a BIG improvement, even when I was upgrading from 570. It is worth every penny.