Intel Chief Executive Paul Otellini says megahertz and gigahertz is out, and “performance per watt” is in.

The new combined measurement is more relevant to smaller, flexible devices, like notebook computers, portable media players and smart phones, because heat and power consumption have a direct impact on performance and battery life.

Using Intel’s “dual core” technology, in which computations are done within two “brains” on a single chip, Otellini predicted that next year notebooks would run at five watts, desktops at 65 watts and servers at 80 watts–a drop from today’s wattage.