Nvidia has released the GTX 760, GTX 770 and GTX 780 video cards. If you are looking at buying a new video card, then skip the GTX 600 series and go straight for the new 700 series.
The 700 series offer more cuda cores, faster clock speed, a wider memory interface width and a higher memory bandwidth. With these better specs, you will get better performance.
We tested the GTX 770 against the GTX 680 and the GTX 770 was faster.
Right now I am testing the GTX 760 video card and it is slightly faster than the GTX 670. Also, I am finding the GTX 760 for only $249.
Again, if you are in the market for a video card, check out the new GTX 700 series.