Socket 478

Socket 478

Type	PGA-ZIF
Chip form factors	Flip-chip pin grid array (FC-PGA2 or FC-PGA4)
Contacts	478 (not to be confused with the new Socket P that also uses 478-pins)
FSB protocol	AGTL+
FSB frequency	400 MT/s 533 MT/s 800 MT/s
Processor dimensions	1.38 × 1.38 inches[1]
Processors	Intel Pentium 4 (1.4 - 3.4 GHz) Intel Celeron (1.7 - 2.8 GHz) Celeron D (2.13 - 3.2 GHz) Intel Pentium 4 Extreme Edition (3.2, 3.4 GHz)
This article is part of the CPU socket series

Socket 478 is 478 contact CPU socket used for Intel's Pentium 4 and Celeron series CPUs. Socket 478 was phased out with the launch of LGA 775.

Technical specifications

Socket 478 has been used for all of the Northwood Pentium 4s and Celerons, the first Prescott Pentium 4s, and all Willamette Celerons and some Willamette Pentium 4s. Socket 478 also supports newer Prescott Celeron Ds, and early Pentium 4 Extreme Edition processors with 2 MiB of L3 cache. The socket was launched with the Northwood core to compete with AMD's 453-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.

Celeron Ds are also available for Socket 478 and were the last CPUs made for the socket.

While the Intel mobile CPUs are available in 478-pin packages, they in fact only operate in a range of slightly differing sockets, Socket 479, Socket M, and Socket P, which are also incompatible with each other.

Mechanical load limits

All socket (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 will crack the processor die and make it unusable.

See also

• List of Intel microprocessors

References

1. ^ "Intel Pentium 4 Datasheet". http://www.intel.com/design/pentium4/datashts/249887.htm. 

External links

• Socket information