https://wccftech.com/nvidia-geforce-gtx-turing-1660-ti-and-1660-confirmed/

In an official presentation, NVIDIA has revealed their upcoming Turing GPUs which will be part of the new GeForce GTX Turing family of graphics cards. The teaser, which is more of a leak as the presentation wasn’t supposed to go public, was most probably given to AIB partners but someone managed to sneakily grab a picture and confirm the existence of the upcoming family once and for all.

The NVIDIA presentation was given to AIBs (Videocardz) to ready their marketing department for the upcoming lineup which would include new Turing based graphics cards. The main difference is that while the existing Turing graphics cards are branded as GeForce RTX, the upcoming cards will be branded in the GeForce GTX family.