Make graham cracker crumbs using a food processor or blender. Stir in melted butter and 1/4 cup sugar. Place in bottom of a 9-inch springform or pie pan. Press in place with a fork. Refrigerate while making the filling.
Combine cream cheese, 2/3 cup sugar, salt, eggs and 1/2 teaspoons vanilla. Beat at medium speed about 5 minutes. Pour into pan over graham cracker crumb crust. Bake at 350F for 25 minutes.
Cool 30 minutes before adding the sour cream topping.
Mix sour cream, 3 tablespoons sugar, and 1 teaspoons vanilla. Spread on top of cheesecake. Bake 20 more minutes at 350°F Cool to room temperature then place in refrigerator. Chill before serving.