Yes. This kind of technique, and the exploitation of minor CPU errata, can be used to help differentiate processor models and steppings. That in turn allows a

Yes. This kind of technique, and the exploitation of minor CPU errata, can be used to help differentiate processor models and steppings. That in turn allows a currently widespread DRM system to download personalised portions of object code that rely on properties specific to the licensed hardware in order to execute properly, in an attempt to counter debugging, emulation and transfer - continuing a tradition practised in copy protection techniques since at least the 6502, maybe even earlier.