This post provides a full introduction to it.
Besides, there are some differences between 2060 and 1660 Ti.
This gives you up to 6X the performance of previous-generation graphics cards.

To learn more information on graphics cards, go to theMiniToolofficial website.
Here are some basic specs of it, you’ve got the option to take a look.
2060 is equipped with a dedicated hardware encoder for unlocking ability games and excellent quality simultaneous streaming.
RTX graphics cards are optimized for your favorite streaming applications to provide the best performance for your live streaming.
NVIDIA GPUs accelerate your work with incredible performance improvements.
RTX 2060 and GTX 1660 Ti both use NVIDIAs latest generation Turing GPU architecture.
GeForce RTX 2060 is a higher graphics card.
The GTX 1660 Ti has fewer CUDA cores and slower memory, resulting in lower memory bandwidth.
For the GTX 1660 Ti, this is a feat even more than the previous generation GTX 1070.
At the same time, the RTX 2060 is comparable to the GTX 1070 Ti.
The value proposition is high, especially when you consider the price of the GTX 1070 at $379.
The price premium of the latter comes from forward-looking hardware acceleration functions, such as real-time ray tracing.
The End
To sum up, you could get some basic specs of GeForce RTX 2060 super.
Besides, there are some differences between 1660 Ti and 2060.
I hope that this post can be helpful to you.