Optics are a big chunk also. A new controller with DAC Gbe phy is probably more like 7-8W. They only need to do the controller on this chip. A couple watts for

Optics are a big chunk also. A new controller with DAC Gbe phy is probably more like 7-8W. They only need to do the controller on this chip. A couple watts for the Phy are part of the motherboards budget.