PREHEAT oven to 350°F. Prepare cake mix as directed on package, reducing water to 1/2 cup and increasing oil to 1/2 cup. Add half of the cream cheese, the pumpkin, cinnamon and ginger. Beat on medium speed until well blended. Stir in chopped chocolate. Pour into greased 12-cup fluted tube pan or 10-inch tube pan.
BAKE 40 to 45 min. or until toothpick inserted in center comes out clean. Cool 10 min. Remove from pan; cool completely on wire rack.
MIX remaining cream cheese, whipped topping and sugar until well blended. Spread on top of cooled cake. Cut into 16 slices to serve