Socket 432 is for the discontinued, obsolete Williamette P4.
Socket 478 is what you want. But on socket 478, you only want one of the new "Northwood" P4 processors. These are identified as the 1.6A, 1.8A, 2.0A, and 2.2. If it doesn't have the "A" on the end or isn't identified with 512Kb cache, then it's the old "Williamette" P4 that you
do not want.
SDRAM is no good. As for DDR vs RDRAM....see the
review posted at Aceshardware in the next day or two.