В случае его включения/работы цопэ должен ЖРАТ больше из-за задействия допонительного набора входных регистров.

In 2006, hyper-threading was criticised for energy inefficiency.[27] For example, specialist low-power CPU design company ARM stated that simultaneous multithreading (SMT) can use up to 46% more power than ordinary dual-core designs. Furthermore, they claimed that SMT increases cache thrashing by 42%, whereas dual core results in a 37% decrease.[28] Intel disputed this claim, stating that hyper-threading is highly efficient because it uses resources that would otherwise be idle or underutilised. [:en.w:]