An important characteristic value of notebooks, subnotebooks and netbooks is the battery life, which is directly dependent on the power consumption of the devices. This is largely determined by the power dissipation of the processors and memory modules. In the case of central processing units, the power dissipation can be reduced by lowering the supply voltage and the clock frequency.
This is already being implemented by CPU manufacturers in low- and ultra-low-voltage (ULV) processors. ULV processors are downsized types of processors used in notebooks; they have a reduced feature set, smaller L2 caches, a lower clock rate and, above all, relatively low supply voltages, ranging between 1.05 V and 1.15 V. Corresponding CPUs like the Celeron M ULV, Atom processor, Pentium SU4100 or the Core 2 have TDP(Thermal Design Power) values of 10 W and below. However, the Core 2 doesn't have any reduced performance values.