@Huey2k2: We could use some more information, mainly what resolution you play games at and the other parts your system is made out of.
If you're running a 19" monitor, it might not make a noticeable difference to step up to a 670. The same goes if your processor or RAM is the bottleneck. If you're gaming on a 1080p or better screen and the rest of your system is in order, there's a fair (10-20%) increase in performance when you go to a 670 over a 660, but that's not how you really want to look at it. Go to places like Guru3D, Tom's Hardware and Anandtech, look at the reviews for those two cards, and pick out a game or two that they use for benchmarks that you play often. If the 660 Ti is getting you acceptable performance (again, you need to define what that is. For me, it's 60FPS as high as everything will go, but most people are happy with 45FPS+ at their default resolution without turning much down. I'm also a crazy person who buys pairs of GPUs, so keep that in mind.) then the 670 isn't necessarily worth it right now. Keep in mind, however, that the 670 is going to maintain that performance level a bit longer. How much longer? Hard to say, but it'll probably stretch itself up to a year longer than the 660 Ti will, assuming a new version of DirectX doesn't come out and everything starts using that for all of the best shiny graphics.
If $100 is worth the performance boost in current games that you play, the possibility of delaying an upgrade by a year (max), and your system can take advantage of the extra oomph, I say go for it.
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