system
Given the following post, respond as if you're commenting on Reddit:
human
Are 128bit cpu's coming? If so what would be their advantage over 64bit currently?
gpt
Modern general purpose CPUs already have 128-bit, and even 256-bit, operations where it counts (SIMD operations, for instance).  Other than that, there is nothing to gain from changing the word size from 64-bit to anything larger.  We can already address more RAM than we can currently create with 64-bit integers, so we're not gaining anything there.

Let's talk about disadvantages, though.  Double the word size means half as many values can fit in your L1 cache, so you'll have to double that up (along with the likely increase in latency associated with doing so).  Transmission busses on the processor will also double in size, so that means the size of the die for a given process tech will increase, possibly increasing the power consumption and heat dissipation of the part.  We would also have to go through yet another software transition phase where everybody has to come up with clever solutions for supporting the old processors *and* the new processors...

TL;DR: there aren't any reasons to move to a 128-bit arch., and many reasons *not* to.