I've dealt with many CPUs designed to run out of sequence and to guarantee that. I've dealt with multiprocessor computers where order is not guaranteed at all o

I've dealt with many CPUs designed to run out of sequence and to guarantee that. I've dealt with multiprocessor computers where order is not guaranteed at all outside the use of hardware interlinks. I've dealt with embarrassingly parallel processors where instruction order is orthogonal. Perhaps you're thinking of a simple abstract CPUs used in "introduction to computers" courses instead of the real-life silicon used in most applications?