Upgrade CPU?

I want to upgrade my CPU on my pcv-rs520 sony vaio desktop. currently i own a pentium 4 3.0HT. Does anybody know where can i grasp a better one without varying my motherboard?

Upgrade CPU?

Im not sure but i think HT processors are socket 478. On newegg.com you can browse processors by socket type. I imagine that socket is a bit outdated at this point though so you might not find much.

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