Can i upgrade my processor?

[silver]

On one of my PC's I have a Intel Pentium 4, Can I go to a duel core or would I have to buy a new mother board?

[Xipeos]

On one of my PC's I have a Intel Pentium 4, Can I go to a duel core or would I have to buy a new mother board?

You give very little information, but most likely your motherboard won't support a core 2 duo (unless it's recent?).

If you're looking for an AMD processor then the answer is more than obvious.

[Michael]

Is your processor Socket 478 or Socket T LGA-775?

[Xipeos]

Is your processor Socket 478 or Socket T LGA-775?

Some chipsets won't work with dual-cores even if you have the right socket, so perhaps it's better if he says what chipset/motherboard he has?