A quick addition to the answer: generally you can not upgrade or change a netbook processor.
They are usually soldered to the main board and changing them would require special tools and skills. If you had both you would probably decide not to try because you would also know chances for failing and rendering the whole device useless are high. In addition to this, you would also need another CPU (processor), which you can not buy from the computer store next door like a new Phenom or Pentium for obvious reasons.