It's fun when you have an idle question and the internet has already answered it, in depth - https://www.reddit.com/r/askscience/comments/2ke0o5/we_have_32_and_64bit_cpus_why_not_a_128bit

It's fun when you have an idle question and the internet has already answered it, in depth - https://www.reddit.com/r/askscience/comments/2ke0o5/wehave32and64bitcpuswhynota128bitcpu/