First you need to make sure if that motherboard of yours will seat something like a 1ghz+ processor. That will make a world of difference in terms of difficulty and cost. It might cost as little as 120-150 dollars for that processor if you shop around, and only require you to pop out that old processor and heatsink. But, if the motherboard doesn't support your new processor, you'll have to buy another motherboard, which will cost you a good 100-150 plus the processor cost. Also, installing a motherboard is a big project if your sorta new, as I suspect you might be. I recently had a bad time with a motherboard (eeeh...we won't reflect on that). However, make sure you get decent cooling for that beast!
for the best prices on what you decide go to www.pricewatch.com if you decide to go with a p-4 motherboard and cpu make sure you have enough power from your power supply I would go with 300 watt or better
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