Looks pretty solid, they should get on OK with that.
The 1660 super should do most games at 60fps+ @ 1440p, medium to high settings, and with Gsync active it will seem even smoother
Bitwit 1660S 1440p review:
View: https://www.youtube.com/watch?v=Yb0G5OnyT10
Price is slightly on the higher...