Socket 370

Socket 370, also known as PGA370, is a CPU socket first used by Intel for Pentium III and Celeron processors to first complement and later replace the older Slot 1 CPU interface on personal computers. The "370" refers to the number of pin holes in the socket for CPU pins.

Socket 370
TypePGA-ZIF
Chip form factorsPlastic pin grid array (PPGA) and Flip-chip pin grid array (FC-PGA and FC-PGA2)
Contacts370[1]
FSB protocolAGTL+, AGTL
FSB frequency66, 100 and 133 MHz
Voltage range1.05–2.1 V
Processor dimensions1.95 × 1.95 inches[2] (49.53 mm x 49.53 mm)
ProcessorsIntel Celeron Mendocino (PPGA, 300–533 MHz, 2.0 V)

Intel Celeron Coppermine (FC-PGA, 533–1100 MHz, 1.5–1.75 V)
Intel Celeron Tualatin (FC-PGA2, 900–1400 MHz, 1.475–1.5 V)
Intel Pentium III Coppermine (FC-PGA, 500–1133 MHz, 1.6–1.75 V)
Intel Pentium III Tualatin (FC-PGA2, 1000–1400 MHz, 1.45–1.5 V)

VIA Cyrix III/C3 (500–1200 MHz, 1.35–2.0 V)
PredecessorSlot 1
SuccessorSocket 423
This article is part of the CPU socket series

Socket 370 was replaced by Socket 423 in 2000.

Overview
A VIA C3 1.2 GHz Nehemiah C5XL CPGA socket-370 microprocessor

Socket 370 started as a budget-oriented platform for 66 MHz FSB PPGA Mendocino Celeron CPUs in late 1998, as the move to on-die L2 cache eliminated the need for a PCB design as seen on Slot 1.

From late 1999 to late 2000, it was Intel's main desktop socket for 100/133 MHz FSB Coppermine Pentium IIIs. In 2001, the Tualatin Pentium III processors brought changes to the infrastructure which required dedicated Tualatin-compatible motherboards; some manufacturers would indicate this with a blue (instead of white) socket. These late sockets were typically compatible with Coppermine processors, but not older Mendocino Celerons.

Some motherboards that used Socket 370 support Intel processors in dual CPU configurations (e. g. ABIT BP6). Other motherboards allowed the use of a Socket 370 or a Slot 1 CPU, but not at the same time.

The VIA-Cyrix Cyrix III, later renamed the VIA C3, also used Socket 370.

Socket 370 slotket adapter

Slotkets are available that allows Socket 370 CPUs to be used on Slot 1 based motherboards. These devices are equipped with their own voltage regulator modules, in order to supply the new CPU with a lower core voltage, which the motherboard would not otherwise allow.

Socket 370 Intel processors mechanical load limits

The weight of a Socket 370 CPU cooler should not exceed 180 grams (6.3 ounces). Heavier coolers may result in damage to the die when the system is improperly handled.

Most Intel Socket 370 processors (Pentium III and Celeron) had mechanical maximum load limits which were designed not be exceeded during heat sink assembly, shipping conditions, or standard use. They came with a warning that load above those limits would crack the processor die and make it unusable. The limits are included in the table below.

Location Dynamic Static
Die Surface 890 N (200 lbf) 222 N (50 lbf)
Die Edge 667 N (100 lbf) 53 N (12 lbf)

Socket 370 Intel processors with integrated heat sink mechanical load limits

All Intel Socket 370 processors with integrated heat sink (Pentium III and Celeron 1.13–1.4 GHz) had mechanical maximum load limits which were designed not be exceeded during heat sink assembly, shipping conditions, or standard use. They came with a warning that load above those limits would crack the processor die and make it unusable. The limits are included in the table below.

Location of integrated heat sink Dynamic Static
surface 890 N (200 lbf) 667 N (100 lbf)
edge 556 N (125 lbf) N/A
corner 334 N (75 lbf) N/A

See also

References
  1. "CPU Sockets Chart". users.erols.com. Retrieved 2009-04-16.
  2. "Intel Pentium III Specifications" (PDF).
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