ARM Cortex-A3 the new ultra efficiency CPU

ARM introduced a new CPU offering a very low power consumption and embedded applications, designed specifically for wearables, Internet of Things things, embedded systems, low-cost boards like the Raspberry Pi or Pi Zero, and other places where power, space, and cost savings are more important than raw performance. It uses the ARMv8 instruction set and is intended as a replacement for the older Cortex A7 and A5 architectures, both of which use the ARMv7 instruction set. However, the Cortex A32 can only run 32-bit code—to save space and power, the ability to run 64-bit code has been removed.~

This is first CPU with the ARMv8 instruction set that doesn't include 64-bit support. But the new instructions still give the A32 a good performance boost over the Cortex A5 and A7, particularly in cryptography performance. As we've seen in ARMv8-based smartphones, better cryptography performance can drastically reduce the performance hit you take when you encrypt a device's storage. For people who still want 64-bit support, the Cortex A35 CPU core offers similar performance and 64-bit instructions in a slightly larger package (ARM says the A32 is about 10 percent faster than the A35 at 32-bit operations, though, so there's a tradeoff either way).

According to ARM the Cortex A32 is about 25 percent more efficient than the older Cortex A7 architecture, thanks to a combination of speed improvements and reductions in power consumption. Like other ARM designs, it's also designed to be scalable—a 100MHz single-core version of the CPU can consume as little as 4mW of power, while a quad-core design at 1GHz can consume "less than 75mW per core" (or around 300mW in total).