A computer, no matter how fast and complex it might be, will at best simulate consciousness and imitate intelligence since - by the way a computer is constructed and used today – the computer is a generator for objects and states in a virtual reality. Virtual reality adds to but does not overlap with the physical reality (corporeality) of our everyday life. Intelligence and consciousness are products of corporeality and are therefore separate from the virtual world computers produce and play in.
The border between these realities is sharp and clear and can not be transcended. As long as a computer is the medium for a simulation, imitation, visualization it will produce objects well within the virtual world. It will never produce intelligence or show consciousness.
But is the computer doomed to be a medium only? No.
Aren't our brains also just media for the play of sensations, thoughts, feelings? No.
The difference lies in the way of operation. Todays computers have separated areas for data and programs. The software is mainly impressed from the outside and only little (if at all) altered by the flow of data coming from an internal or external process.
In the brain data and 'program' are intertwined results of 'hardware' and states. The homoeostasis of the system balances the relations between data-intake, output, flow and – mode of operation. The sensoric and operations- parts of the system are influenced by the data-stream. The whole system is a balance of states, where input and output are often not clearly distinguishable. There is no well-defined separation of software and data.