any idea approx. how much time between chargings i'll lose to up my MB2.0 C2D from 1Gb to 2Gb? and, if there's a difference, will it make any difference which brand chips are more energy pinching? and i'll drop in a 7200HDD. any preferences -- Momentus/Travelstar? i've heard noises are a problem in the Travelstar and heat is a problem with Momentus.