I wanted to ask whether the Nvidia gtx 1660 is sufficient for games like Rainbow six siege, CSGO or Minecraft?
Yes, it is enough for that
OK thanks
Should be enough if you don't want to play in 1440p or even 4k
If you're playing in full HD, that's definitely enough. I have it myself and in Full HD it is still good there. No fps miracle in newer games, but sufficient with the appropriate settings.