Why we don’t have 128 bit OS or CPUs?

Question

Why we don’t have 128 bit OS or CPUs?

In: 927

Answer 1

Modern x86 CPUs already have some memory and operations which work on a 128 bit base (SSE and AVX extensions). It just does not make much sense or bring big advantages to use them as a general base.

64 bit addresses are enough for current memory and 128 bit numbers are not used so often (and for the cases where you would use them you have these extensions).

And 128 bit CPUs would most likely be more complex and need larger chip sizes (and therefore would be more expensive and need more energy). And doing that for little to no advantage makes no much sense.