it depends on the cpu you get and what the codes are on it.
there are 3 models - a 45 watt barton, a 72 watt barton and a 72 watt throrughbred
click here this is a good file for identifying cpu's
the multiplier on these chips is unlocked so laptops can reduce the multiplier and underclock the cpu which reduces power usage
if you have it in a desktop and overclock it this increases power usage - because you normally have to increase the vcore voltage which also increases the cpu temp.