While process advances will allow ever greater numbers of functional units ( e.g. , ALUs ) , the burden of checking instruction dependencies grows so rapidly that the achievable superscalar dispatch limit is fairly small , likely on the order of five to six simultaneously dispatched instructions .
While hardware advances will allow greater numbers of functional units ( e.g. , ALUs ) , the problem of checking instruction dependencies increases to a limit that the achievable superscalar dispatching limit is somewhat small .