Yes, the GTX 1660 Super can run PL9. Currently, I am on 9.4 and I can use the AI preset masks e.g. sky, people or animals.
My computer has the same CPU as yours but I also have 32GB ram.
32gb i5-10400F CPU GTX1660 Super 6GB, Driver 511.09
Note the driver version. Many have reported problems with the newer drivers. I never “updated” my driver and this is what is installed.
Also, under Performance, OpenCL is not enabled. I found this does not work for me
So, try installing the older driver if it is not installed and possibly increase the ram.
Have a look at this thread where I talk about this.
Allan