TechSpot decided to test out NVIDIA's claims that the GTX 1660 is 113% faster than the old GTX 960, which is still sitting in the top five for most used GPUs on the Steam charts.  They tested Apex Legends, The Division 2, Shadow of the Tomb Raider and many other games at 1080p as that is what these cards were designed for and then compiled the results.  Wolfenstein II:TNC showed the most improvement with 177% while Middle Earth Shadow of War sat at the bottom with a mere 54% jump with the overall average hitting 117%. 

Not a bad upgrade choice, though as they point out the RX 580 8GB is a strong contender for GTX 960 users as well.

"When we recently tested the new GeForce GTX 1660 we noted that Nvidia was making a bold claim in the review guide saying that the 1660 was a whopping 113% faster than the GTX 960, making it a perfect upgrade option for owners of the old mid-range Maxwell GPU."

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