Preheat oven to 375 and grease a 9x13 pan. Later half of the cake mix in the bottom of the pan, then pour peaches evenly over top (with syrup). Layer the rest of the cake mix over peaches. Grate chilled butter with a cheese grater, then sprinkle evenly over the top. Bake 45 minutes or until lightly golden brown. Serve with vanilla ice cream and whipped cream!