I don't think the wattage of the system is the best indicator of whether it's 160 or 320 shaders, because Latte likely runs 15-20 watts, and it's not breaking the laws of physics doing that. Look at the Mobility Radeon HD 5650, the entire GRAPHICS CARD runs between 15 - 19 watts, the GPU itself is drawing less than that, and this card has both a higher clock (650mhz), and 400 stream processors.