i815: onboard i752 graphics, ICH0 with ATA66, 2 USB, AMR
i815E: onboard i752 graphics, ICH2 with ATA100, 4 USB, CNR with onboard Intel PRO100+ VE NIC
i815EP: same as i815E, no onboard i752 graphics.
NO current i815(E/P) chipset supports Tualatin processors. Support will be added in the i815G/EG or i815B.