Socket 478 was used for allNorthwood Pentium 4 andCeleron processors. It supported the firstPrescott Pentium 4 processors and allWillamette
Celerons, along with several of the Willamette-series Pentium 4s. Socket 478 also supported the newer Prescott-based Celeron D processors and early Pentium 4 Extreme Edition processors with 2 MB of L3