And watch out with the 980 Pro, Samsung has just changed the components.
Samsung have removed the Elpis controller from the 980 PRO and replaced it with an unknown one, and also removed any speed reference from the spec sheet.
Take a look here for what's changed on the 980 PRO: https://www.guru3d.com/index.php?ct=news&action=file&id=4489...
It's OK for them to do this, but then they should give the new product a new name, not re-use the old name so that buying it becomes a "silicon lottery" as far as performance goes.