Mac pro 1st gen lga-771 socket?

I have an early Mac Pro 1st gen. Can I replace the original 2.66 dual core cpu's with the intel 5482's? The Mac Motherboard I believe is socket 771 with 667fsb. I believe the intel 5482's are also socket 771. Will they work and if not, what is the best/fastest quad core cpu that will work in this machine by todays standards 2011?
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  1. You can use any of the Clovertwon Xeon's. Keep your mind on cooling and power if you upgrade to quads as they are 120w compared to the original 80w cpu's.
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