Both probably the same If you are into OCing try to to find what the ram is 2.2, 2.5,2.8 the lower the better.
even if it is 2.8 it will still be okay for a small OC.
Your P4 2.0 will be little bit of a bottle neck but either way u will see ALOT of improvment compared to whatever u have now assuming it less than a GeForce 3.