Socket 478, also known as mPGA478 or mPGA478B, is a 478-contact

CPU socket In computer hardware, a CPU socket or CPU slot contains one or more mechanical components providing mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows for placing and replacing the centr ...

used for

Intel Intel Corporation is an American multinational corporation and technology company headquartered in Santa Clara, California, and Delaware General Corporation Law, incorporated in Delaware. Intel designs, manufactures, and sells computer compo ...

Pentium 4 Pentium 4 is a series of single-core central processing unit, CPUs for Desktop computer, desktops, laptops and entry-level Server (computing), servers manufactured by Intel. The processors were shipped from November 20, 2000 until August 8, 20 ...

and

Celeron Celeron is a series of IA-32 and x86-64 computer microprocessor, microprocessors targeted at low-cost Personal computer, personal computers, manufactured by Intel from 1998 until 2023. The first Celeron-branded CPU was introduced on April 15, ...

series

CPUs A central processing unit (CPU), also called a central processor, main processor, or just processor, is the primary Processor (computing), processor in a given computer. Its electronic circuitry executes Instruction (computing), instructions ...

. Socket 478 was launched in August 2001 in advance of the Northwood core to compete with

AMD Advanced Micro Devices, Inc. (AMD) is an American multinational corporation and technology company headquartered in Santa Clara, California and maintains significant operations in Austin, Texas. AMD is a hardware and fabless company that de ...

's 462-pin

Socket A Socket A (also known as Socket 462) is a zero insertion force pin grid array (PGA) CPU socket used for AMD processors ranging from the Athlon Thunderbird to the Athlon XP/MP 3200+, and AMD budget processors including the Duron and Sempron. ...

and their

Athlon XP AMD Athlon is the brand name applied to a series of x86-compatible microprocessors designed and manufactured by Advanced Micro Devices. The original Athlon (now called Athlon Classic) was the first seventh-generation x86 processor and the fi ...

processors. Socket 478 was intended to be the replacement for

Socket 423 Socket 423 is a 423-pin CPU socket used by Intel's first generation of Pentium 4 processors based on the Willamette core. This socket was short-lived, as it became apparent that its electrical design proved inadequate for raising clock speeds be ...

, 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 LaGuardia Airport ( ) – colloquially known as LaGuardia or simply LGA – is a civil airport in East Elmhurst, Queens, New York City, situated on the northwestern shore of Long Island, bordering Flushing Bay. Covering , the facility wa ...

) interface. Socket 478 was phased out with the launch of

LGA 775 LGA 775 ( land grid array 775), also known as Socket T, is an Intel desktop CPU socket. Unlike PGA CPU sockets, such as its predecessor Socket 478, LGA 775 has no socket holes; instead, it has 775 protruding pins which touch contact points on th ...

in 2004.

Technical specifications

Socket 478 was used for all Northwood Pentium 4 and

processors. It supported the first Prescott Pentium 4 processors and all Willamette Celerons, along with several of the Willamette-series Pentium 4s. Socket 478 also supported the newer Prescott-based Celeron D processors (which were also one of the last CPUs made for the socket), and early Pentium 4 Extreme Edition processors with 2 MB of L3

CPU cache A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory. A cache is a smaller, faster memory, located closer to a processor core, whi ...

. While Intel's mobile CPUs are available in 478-pin packages, they in fact only operate in a range of slightly differing sockets such as

Socket 479 Socket 479 (mPGA479M) is a CPU socket used by some Intel microprocessors. It is primarily known as the socket used by Pentium M and Celeron M mobile processors normally found in laptops, however the socket has also been used with Tualatin (micropr ...

Socket M Socket M (mPGA478MT) is a CPU interface introduced by Intel in 2006 for the Intel Core line of mobile processors. Technical specifications Socket M is used in all Intel Core products, as well as the Core-derived Dual-Core Xeon codenamed Sossama ...

, and

Socket P The Intel Socket P (mPGA478MN) is the mobile processor socket replacement for Core microarchitecture chips such as Core 2 Duo. It launched on May 9, 2007, as part of the Santa Rosa platform with the Merom and Penryn processors. Technical ...

, all of which are electrically incompatible with each other including Socket 478. Socket 478 is used in combination with

DDR SDRAM Double Data Rate Synchronous Dynamic Random-Access Memory (DDR SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) class of memory integrated circuits used in computers. DDR SDRAM, also retroactively called DDR ...

, as well as SDR SDRAM,

RDRAM Rambus DRAM (RDRAM), and its successors Concurrent Rambus DRAM (CRDRAM) and Direct Rambus DRAM (DRDRAM), are types of synchronous dynamic random-access memory (SDRAM) developed by Rambus from the 1990s through to the early 2000s. The third-generati ...

and

DDR2 SDRAM Double Data Rate 2 Synchronous Dynamic Random-Access Memory (DDR2 SDRAM) is a double data rate (DDR) synchronous dynamic random-access memory (SDRAM) interface. It is a JEDEC standard (JESD79-2); first published in September 2003. DDR2 succeed ...

Heatsink

The 4 holes for fastening the heatsink to the motherboard are placed in a rectangle with lateral lengths of 60 mm and 75 mm.

Mechanical load limits

All sockets (Pentium 4 and Celeron) have the following mechanical maximum load limits which should not be exceeded during heatsink assembly, shipping conditions, or standard use. Load above those limits may crack the processor die and make it unusable. The limits are included in the table below.

Technical specifications

Heatsink

Mechanical load limits

Chipsets

Intel

See also

References

External links