I have an old eMachines computer(about 3 or 4 years old i think) and my wonder is, could i take out the Mobo, and put in another Mobo with a new CPU and some new RAM? or is built into prebuilt computers that you cannot remove parts? The three things i need to address with the computer now is CPU speed, amount of RAM, and an update on the GPU, and i think instead of building an entire custom setup, the swap might be possible?