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This guide might be of help for people attempting to do the same thing:
It might also help to know that I tried a working Intel P8700 processor in a Dell D830 and it did not work; I strongly suspect because the processor is 1066 Mhz and suspect the 965 chipset does not support front system bus speeds of 1066. I have not spent enough time verifying whether the chipset will support 1066 bus speeds, but my failed attempt tells and the compatibility guide seem to indicate that it does not.
I hope this helps someone.