It uses the five senses: touch, smell, hearing, taste and sight and takes in information and produces knowledge. On the other hand, the CPU of computers takes in data from the typing of the keyboard and processes it, which is very limited. However, it is only human beings feeding data, writing software programs and making the computer behave like a brain although not quite so.
The brain is still more intelligent than the CPU of computers and has yet to train the computer to behave like the brain of a human being. Yes, computers will be able to take over many tasks of human beings but without human beings, they are lifeless because humans have to give life to these computers, operate on them and have regular updating, monitoring and maintenance on them.