There are several different companies that design microprocessors. There is Intel, AMD, Imagination (MIPS), and Oracle (Sun SPARC) to name a few. However, none of these companies is known exclusively for their power efficiency. One company that does specialize in energy efficient processors is ARM.
From small microcontrollers to its multi-core 64-bit processors, ARM is responsible for the design and intellectual property in everything from white goods to server farms. The use of ARM based processors in smartphones and tablets means that both Android and iOS users rely on these chips every day. Learn more about developing on ARM!