This is my noob moment; and I may well deserve to be shot by even asking this questions
But which one is better? I've got the 820 chip sitting on my desk that a friend abandoned...
I'm currently using the P4 640 chip on stock speeds. My motherboard & cooling is decent enough to allow for over clocking.
I want to make the best of what I have until I can afford to buy a new chip (eying the E8400)
I have a computer with a Pentium 4 630 (3.0Ghz, 800Mhz, 2mb) and a computer with a Pentium D 925 (3.0Ghz, 800Mhz, 2x2mb). The Pentium D is MUCH faster. I was amazed that a processor with such a bad reputation was so much better than it's predecessors. Definitely go with the Pentium D. It's no Core 2 Duo, but it works.