Mobile processor

A CPU chip is designed for portable computers to run fanless, under 10 to 15W, which is cool enough without a fan.

[1] It is typically housed in a smaller chip package, but more importantly, in order to run cooler, it uses lower voltages than its desktop counterpart and has more sleep mode capability.

A mobile processor can be throttled down to different power levels or sections of the chip can be turned off entirely when not in use.

[2] One of the main characteristics differentiating laptop processors from other CPUs is low-power consumption, however, they are not without tradeoffs; they also tend to not perform as well as their desktop counterparts.

Cell phones and PDAs use "system on a chip" integrated circuits that use less power than most notebook processors.