Socket 478
Specifications
Type	PGA-ZIF
Chip form factors	Flip-chip pin grid array (FC-PGA2)
Contacts	478
Bus Protocol	AGTL+
FSB	400 MT/s 533 MT/s 800 MT/s
Voltage range
Processors	Intel Pentium 4 (1.4 - 3.4 GHz) Intel Celeron (1.7 - 3.2 GHz) Celeron D (to 3.2 GHz) Intel Pentium 4 Extreme Edition (3.2, 3.4 GHz)
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. Image File history File links Download high resolution version (755x809, 192 KB) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Flip-Chip Pin Grid Array (FC-PGA or FCPGA) is the package of certain Intel Celeron, Pentium III, and Pentium 4 microprocessors. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... New Intel Pentium 4 with Hyper Threading logo The Pentium 4 is a seventh-generation x86 architecture microprocessor produced by Intel and is their first all-new CPU design, called the NetBurst architecture, since the Pentium Pro of 1995. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... Celeron D logo as of 2006. ... 633MHz Celeron A Celeron is any of a large number of different budget x86 microprocessors produced by Intel and marketed as a second line to complement their more expensive but higher-performance Pentium CPUs. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... New Intel Pentium 4 with Hyper Threading logo The Pentium 4 is a seventh-generation x86 architecture microprocessor produced by Intel and is their first all-new CPU design, called the NetBurst architecture, since the Pentium Pro of 1995. ... Socket 370 processor socket The term CPU socket (or CPU slot) is widely used to describe the connector linking the motherboard to the CPU(s) in certain types of desktop and server computers, particularly those compatible with the Intel x86 architecture. ... Originally, the word computing was synonymous with counting and calculating, and a science and technology that deals with the original sense of computing mathematical calculations. ... Socket 370 processor socket The term CPU socket (or CPU slot) is widely used to describe the connector linking the motherboard to the CPU(s) in certain types of desktop and server computers, particularly those compatible with the Intel x86 architecture. ... Intel Corporation (NASDAQ: INTC, SEHK: 4335), founded in 1968 as Integrated Electronics Corporation, is an American multinational corporation that is best known for designing and manufacturing microprocessors and specialized integrated circuits. ... New Intel Pentium 4 with Hyper Threading logo The Pentium 4 is a seventh-generation x86 architecture microprocessor produced by Intel and is their first all-new CPU design, called the NetBurst architecture, since the Pentium Pro of 1995. ... Celeron D logo as of 2006. ... CPU redirects here. ... Socket T, also known as LGA 775, is Intels latest CPU socket. ...

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 L1 cache and some Core Duos. The socket was launched with the Northwood core to compete with 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 which remained in the market for only a short time. Look up cache in Wiktionary, the free dictionary. ... It has been suggested that this article or section be merged into Intel Core. ... Advanced Micro Devices, Inc. ... Socket A (also known as Socket 462) is the CPU socket used for AMD flagship processors ranging from the Athlon K7 to the Athlon XP 3200+, and AMD budget processors including the Duron and Sempron. ... Athlon is the brand name applied to a series of different x86 processors designed and manufactured by AMD. The original Athlon, or Athlon Classic was the first seventh-generation x86 processor and, in a first, retained the initial performance lead it had over Intels competing processors for a significant... Socket 423 was a CPU socket used for the first Pentium 4 processors, based on the Willamette core. ...

Motherboards that use this socket support DDR, RDRAM, and in some cases SDRAM. However, the majority of boards are DDR based. Initial motherboards only supported RDRAM, however RDRAM is quite expensive, compared to DDR and SDRAM,and consumers demanded an alternative, thus DDR and SDRAM boards were made. Later revisions to chipsets that support Socket 478 added higher FSB speeds, higher DDR speeds, and support for dual channel DDR. RDRAM memory with integrated heatsink. ... Several SDRAM ICs on a DIMM package. ...

Like the previous Socket 423, Socket 478 is based on Intel's Quad Data Rate technology, with data transferring at four times the clock rate of its Front Side Bus. As such, the 400 MT/s bus was based on a 100 MHz clock signal, but was still able to provide 3.2GB/s of data to the chipset. At its release, no SDRAM product was capable of supporting so high a data rate, so Intel pushed forward RDRAM technology, with two channels of PC800 providing synchronous data capability. Poor consumer acceptance of expensive RDRAM lead Intel to release low-performance PC133-supporting chipsets, and finally DDR chipsets.

While the original 400 MT/s bus matched the data rate of PC3200, this bus speed was already outdated by the time PC3200 became available. Dual-channel memory was introduced on later chipsets, so that a matched pair of PC3200 modules was able to match the final 800 MT/s FSB.

While Core Duo uses a 478-pin socket, that socket is not Socket 478. Socket 478 is also known as FCPGA4; Core Duo's socket is FCPGA6.^{[citation needed]}

Pentium M and Celeron M are also listed to support socket 478 (as well as socket 479) on Intel's website. [1]