6700 xt is a popular card that is over 2x of 1060. https://www.techpowerup.com/gpu-specs/radeon-rx-6700-xt.c3695
If you check the relative performance list you can find other options if you want something even faster. 6700 xt is meh at ray tracing, look to nvidia instead if you want good rt and prepare to buy higher tier card too.
Based on these results some are at 2x16 4400
That does not guarantee you are going to get 4400 problem free, I suggest going max 4000-4266.
If you click those results in the list, you will see many who achieved over 4400 are using just 2x8 kits, 2x16 or 4x8 does not go quite as high.