Sprinkle the 4 crushed Oreos evenly over the bottom of the graham cracker crust.
In a large bowl, beat the cream cheese, sour cream, sugar, vanilla, and salt until completely smooth, about 2 minutes.
Gently fold in the entire container of Cool Whip until fully combined and no streaks remain.
Fold in the 10 finely crushed and 6 roughly chopped Oreos.
Spoon the filling into the crust and smooth the top with a spatula.
Refrigerate at least 4 hours, preferably overnight, until set. To speed it up, freeze 30-45 minutes, then refrigerate 1-2 hours.
Before serving, spread or pipe the 1 cup Cool Whip over the top. Sprinkle with crushed Oreos and drizzle lightly with the cooled hot fudge.
Slice and serve cold.