Reduce the temperature of the oven to 325°
In a stand mixer, or large bowl with a handheld mixer, beat together softened cream cheese and granulated sugar until light and fluffy.
One at a time, add in the eggs and mix on low until each is fully incorporated.
Next, mix in sour cream, vanilla, flour and salt.
Over a double boiler or in the microwave in 30 second increments, slowly melt the white chocolate and cream
Pour the melted chocolate into the cream cheese batter and mix to incorporate.
Pour half the batter over the crust in the springform pan.
Use a spoon to gallop 1/3 of the raspberry coulis onto the batter and gently swirl into the batter. Pour the remaining batter on top, followed by 1/3 of the coulis. Use the spoon again to create swirls of the raspberry into the batter
Place a shallow baking dish into the oven and place the springform in the center of the dish. Pour 3-4 cups of water into the baking dish around the springform pan, careful not to get any water in the cheesecake batter.
Bake for 1 hour 15 min, and without opening the oven door, turn off the heat of the oven and keep the cheesecake inside for another hour.
Cover with a tight layer of plastic wrap and then foil and transfer the cheesecake to a refrigerator for at least 8 hours, or overnight.
To serve, slice and pour a spoonful of the remaining coulis over the top of each slice.