192 bit interface vs 256

Considering I've been looking heavily into Video Card technology and how they differ in comparison one thing I was wondering is with the 660ti it has a 192 memory interface (think that is what it is called.) and the 670 has a 256. What does that translate to exactly besides a few fps? And on that note the 680 has a 256 interface as well. Is there a link someone could provide, or an explanation on how all these compare or what it means?
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  1. Check this GTX 660 Ti review, you'll get a rough idea how much it is behind GTX 670:
    http://www.techpowerup.com/reviews/ASUS/GeForce_GTX_660_Ti_Direct_Cu_II/
  2. Basically it means that it won't be able to handle higher resolutions as well as the GTX 670 because of the reduced bandwidth.

    Because of the 25% reduction in bandwidth, a stock GTX 660 ti performs between 10-20% worse than the GTX 670 in games. (although a overclock can result in it performing just as well as a stock GTX 670)
  3. killerhurtalot said:
    Basically it means that it won't be able to handle higher resolutions as well as the GTX 670 because of the reduced bandwidth.

    Because of the 25% reduction in bandwidth, a stock GTX 660 ti performs between 10-20% worse than the GTX 670 in games. (although a overclock can result in it performing just as well as a stock GTX 670)

    So far what I've gathered then is on a single monitor 1080p the 680 is overkill, but the 670 is feasible albeit kind of a waste. With that in mind what is the difference between a standard model and a FTW (For the win edition)?
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