Well sure, different implementations behave differently. It still has nothing to do with being OoOE... A 486 and an original Atom are both in order implementat

Well sure, different implementations behave differently. It still has nothing to do with being OoOE... A 486 and an original Atom are both in order implementations the i386 architecture (though both also implement other extensions), but knowing how code runs on one tells me nothing about the other, and if I just have an ISA reference the i386 without additional documentation or hardware to test on I won't be able to predict how code I write performs on either of them.