The original ARM team was given a power budget of 1 watt, but when the first silicon was made they found they had accidentally made it so efficient that it ran

The original ARM team was given a power budget of 1 watt, but when the first silicon was made they found they had accidentally made it so efficient that it ran on a tenth of a watt. There is a nice little first-hand history of the early days of ARM here: https://www.theregister.com/Print/2012/05/03/unsung_heroes_of_tech_arm_creators_sophie_wilson_and_steve_furber/ https://www.theregister.com/Print/2012/05/03/unsung_heroes_o...