Preheat oven to 350. Wrap 9 inch springform pan 3 times in heavy foil.

Pulse graham crackers in food processor until finely ground. Place in bowl and add sugar, melted butter and salt. With clean hands combine, then press evenly into bottom of pan. Bake for 10 minutes, then cool completely. Reduce oven heat to 325.

Place cream cheese and marscarpone in mixer bowl. Mix on medium speed for 3 minutes. Add sugar and beat for additional 3 minutes. Add salt and vanilla, then eggs one at a time, still on mediums speed. Add sour cream and then heavy cream. Scrape down sides and bottom of bowl. Pour into prepared pan. Set cheesecake into large roasting pan and pour 2 quarts boiling water into pan. Set on lower oven rack and bake 1 1/2 hours. Turn off heat, crack door one inch and let sit one hour.

Remove from oven and cover with foil, without touching top of cheesecake. Chill at least 4 hours or overnight.

Just before serving mix sour cream with vanilla and confectioners sugar, chill while preparing pineapple. In small skillet melt butter over high heat, add pineapple and sprinkle brown sugar over fruit. Cook stirring, until fruit is brown and caramelized. Spread sour cream topping over cheesecake top and place fruit on top.