hello RS,
Processors have a specific pin count and will only be compatible with
motherboards with that same pin count. So, unfortunately, P3s and P4s
are not interchangeable, nor is the P4 with that AMD chip. You will
have to upgrade your motherboard to a corresponding P4 socketed board.

-Matt


RS wrote:
> I have two older computers. One has a P3 866 Intel chip. The second has an
> AMD 600 chip. A friend has given me a P4 1.8 chip out of a parted out
> computer.
>
> Can I just plug the P4 chip into either my computers (replacing the existing
> chip)for an upgrade or is there more to it than that?
>
> Thank you.
>
> RS
>
>