This article relies largely or entirely on a single source. (September 2021)
A CPU chip is designed for portable computers to run fanless, under 10-15W, which is cool enough without a fan. 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. Further, the clock frequency may be stepped down under low processor loads. This stepping down conserves power and prolongs battery life.
- "Fanless computer boards are pushing 15W to the limit". 15 October 2015.