There's absolutely nothing wrong with energy efficient processors barnetti. IMHO, these are better in many ways. Less power consumption is an obvious advantage. Your
CPU uses even less power when not being used. Less Power = a cooler
CPU. Cooler
CPU = slower fan speed. Slower fan speed = less noise. All advantages, and no performance loss as far as I can tell, or at least, nothing you will notice!
EDIT: Marked as answered.