Preheat oven to 350 degrees F (175 degrees C). Grease and flour a Bundt pan.
Prepare batter according to instructions on cake mix package. Stir in 1 1/2 cups chocolate chips. Reserve remaining chips.
Pour batter into Bundt pan. Bake at 350 degrees F (175 degrees C) for 35 to 40 minutes, or until toothpick inserted into center of cake comes out clean.
Cool for 10 minutes in pan, then turn out onto a wire rack. Before cake is cool, pour reserved chocolate chips on top.
