Socket 478

Socket 478

Type	PGA-ZIF
Chip form factors	Flip-chip pin grid array (FC-PGA2)
Contacts	478
FSB protocol	AGTL+
FSB frequency	100 MHz (Quadpumped), FSB400 133 MHz (Quadpumped), FSB533 200 MHz (Quadpumped), FSB800
Processors	Intel Pentium 4 (1.600 - 3.400 GHz) Intel Celeron (1.700 - 3.200 GHz ) Celeron D (to 3.2 GHz Intel Pentium 4 Extreme Edition (3.200, 3.400 GHz) Core Duo
This article is part of the CPU socket series

In computing, Socket 478 is a type of CPU socket used for Intel's Pentium 4 and Celeron series CPUs. Socket 478 is being phased out with the launch of LGA 775. (LGA stands for Land Grid Array, referring to the fact that the pins are on the motherboard.)

Socket 478 has been used for all of the Northwood Pentium 4s and Celerons, the first Prescott Pentium 4s, and some Willamette Celerons and Pentium 4s. Socket 478 also supports newer Prescott Celeron Ds, and early Pentium 4 Extreme Edition processors with 2MB of L3 cache and some Core Duos. The socket was launched with the Northwood core to combat AMD's 462-pin Socket A and their Athlon XP processors. Socket 478, which accommodates high- and low-end processors, was also the replacement for Socket 423, a Willamette processor socket that did not have a long life.