Preliminary reports position the upcoming Navi-14-based Radeon RX 5500 GPu as a direct competitor for Nvidia's GTX 1660 solutions. Even though the memory bus is not as wide compared to the Nvidia GPUs, the RX 5500 compensates with up to 8 GB of GDDR6 VRAM plus higher core and memory clocks.
https://www.notebookcheck.net/AMD-to-announce-the-Radeon-RX-5500-on-October-7.436707.0.html