No, neither of them cards would be a significant improvement. The 960 is around 680 performance, and the 670 was only a small amount slower than the 680.
Unless you're upgrading to at least an r9 380X I'd say not worth.
RobCrezz :
No, neither of them cards would be a significant improvement. The 960 is around 680 performance, and the 670 was only a small amount slower than the 680.
970 minimum for an upgrade IMO.
Would it be worth upgrading to an R9 380X? Or is that also a waste?