One of the key features Apple has been pushing in its new iPhone 5s is the appearance of a "64-bit" A7 mobile processor. Apple's smartphone doubles the number of CPU registers in its flagship smartphone, leaving the competition in the dust with their 32-bit handsets. Samsung has, however, been quick off the mark in announcing that it'll be following Apple down the road to 64 bits, with a similar chip in the pipeline. So what's all the fuss about?
Whether made by Apple, Samsung or Qualcomm, mobile processors are all based on the ARM architecture. However, ARM exists in several versions, with different instruction sets. Until now, the processors used in mobile phones and tablets have used a 32-bit ARMv7 architecture.