Socket 478

Socket 478

Release date	2001
Designed by	Intel
Type	PGA-ZIF
Chip form factors	Flip-chip pin grid array (FC-PGA2 or FC-PGA4)
Contacts	478 (not to be confused with the newer Socket P or the similar Socket 479)
FSB protocol	AGTL+
FSB frequency	400 MT/s 533 MT/s 800 MT/s
Voltage range	1.25 V - 1.525 V
Processor dimensions	35 mm x 35 mm[1]
Processors	Pentium 4 (1.4–3.4 GHz) Celeron (1.7–2.8 GHz) Celeron D (2.13–3.2 GHz) Pentium 4 Extreme Edition (3.2–3.4 GHz)
Predecessor	Socket 423
Successor	LGA 775
This article is part of the CPU socket series

Socket 478, also known as mPGA478 or mPGA478B, is a 478-contact CPU socket used for Intel's Pentium 4 and Celeron series CPUs.

Socket 478 was launched in August 2001 in advance of the Northwood core to compete with AMD's 462-pin Socket A and their Athlon XP processors. Socket 478 was intended to be the replacement for Socket 423, a Willamette-based processor socket which was on the market for only a short time.

This was the last Intel desktop socket to use a pin grid array (PGA) interface. All later Intel desktop sockets use a land grid array (LGA) interface.

Socket 478 was phased out with the launch of LGA 775 in 2004.