they basically use socket775 or socket T mobos
the names are different . . . pentium 530, 540, 550, 560
but they are still 3GHz, 3.2GHz, 3.4, etc, i think all prescotts
the only thing thats REALLY different are the motherboard and their chipsets
*scooting over to intel.com for complete list*
theyre called 915P, 915G, and 925X (obviously the latter being the best)
they support the new pcix16, which is supposed to be twice as fast as 8xAGP
they also have dual channel DDR2, which is ram running at 533MHz
915p and 915g both support ddr2 and ddr, but 925x ONLY support ddr2 ( i think )
the bandwidth between the memory and i/o controllers has improved by 7.5 times
also, their integrated sound is now for 7.1 speakers, up from 5.1
they say it supports dolby ac3, which i think is high-def audio
also, just like centrino, they will support integrated wireless
hope that answers your question