In 1-quart saucepan, mix granulated sugar and corn syrup; cook over medium heat 4 to 6 minutes (do not stir). Stir in butter, 1/3 cup whipping cream and 1 cup macadamia nuts. Cook 4 to 5 minutes, stirring frequently, until hot. Carefully spread in crust. Freeze until set, about 20 minutes.