A stacked memory device for a configurable bandwidth memory interface includes a first number of contact pads arranged in a pattern on a first surface of the memory device and a second number of contact pads arranged in the same pattern on a second surface. In a center portion of the print area, most intersections of the printing-direction walls and the perpendicular walls are defined by T-shaped intersections where the perpendicular walls do not cross the printing-direction walls, but meet the printing-direction walls in a T-shaped arrangement. A cumulative toner supply amount holding section holds a cumulative toner supply amount.