No. If you can overclock your Q6600 to at least 3ghz, then there is no reason to upgrade. Definately not i3 since that's a dual core processor and you already have a quad.
Considering you would need a new mobo, cpu and ram, it would not be a very smart upgrade imo.
Not sure how to overclock or what overclock is
, my ghz is 2.4. what is mobo? Initially it came with 2GB and I put an additional 2GB in, taking it to the Max of 4GB. Thanks again,