Socket 370 / Socket PGA370

Socket 370 (also called PGA370) is a PGA socket designed to work with Intel Celeron and Pentium III processors in Pin Grid Array (PGA) package. There are three different revisions of the socket 370:

  • Originally the Socket 370 (PGA370) was designed for Celeron Mendocino CPUs. These processors were manufactured in plastic PGA (PPGA) package, ran at speeds 300 MHz - 533 MHz, and had 66 MHz front-side bus and 2V core voltage. Original Socket 370 is not compatible with Coppermine and Tualatin Intel processors. It is possible to run Coppermine processors in this socket with the help of special PPGA-to-FC-PGA adapters, for example, PowerLeap PL-NeoS370.
  • To support newer Coppermine Celeron and Pentium III processors Intel revised specifications for the socket 370. The revised socket was mechanically compatible with the original specification, but there were differences in electrical specifications. As a result, new Coppermine CPUs would not work in the original socket, even though they would fit into it. Revised Socket 370 supported Coppermine processors running at speeds 533 MHz - 1133 MHz with FSB 100 and 133 MHz and core voltages in the range from 1.5V to 1.8V. Tualatin Pentium III processors were not directly supported by the socket, though it was possible to run them in the socket with the help of Tualatin adapters (for example, PowerLeap Neo/T). Many motherboards with this PGA370 socket revision also supported Celeron processors in PPGA package.
  • With the introduction of new Tualatin Pentium III core the socket 370 was revised once again. Like the previous revision of the socket, the second revision was mechanically compatible with old sockets, but electrically incompatible with previous socket revisions. This socket revision supported Tualatin processors in the range from 1 GHz to 1.4 GHz with FSB 100 and 133 MHz and core voltages 1.45V and 1.5V. Majority of motherboards with this revision of the socket 370 were also compatible with older Coppermine Pentium III and Celeron processors.

Visually it's not possible to distinguish between different revisions of the socket 370 (PGA370), they all look like the socket on the picture below:

Picture of Socket 370

The socket has 370 pin-holes - hence the name Socket 370, and it has the same size as the Socket 7. There are two differences between these sockets:

  • Socket 370 processors don't have 2 corner pins while Socket 7 processors don't have only one corner pin. The extra corner pin doesn't allow Socket 7 processors to fit into PGA370 socket.
  • There are 6 rows of pins between the edge and the center of the processor for Socket 370 processors, and 5 rows for Socket 7 processors.

Socket 7 and Socket 370 processors

Supported processors

Celeron (Mendocino) (300 MHz - 533 MHz), the fastest Celeron PPGA is Celeron 533
Celeron (Coppermine) (533 MHz - 1100 MHz)
Celeron (Tualatin) (900 MHz - 1500 MHz)
Pentium III (Coppermine) (500 MHz - 1133 MHz)
Pentium III (Coppermine-T) (800 MHz - 1133 MHz)
Pentium III (Tualatin) (800 MHz - 1400 MHz)
VIA C3 (FC-PGA) (466 MHz - 1000 MHz)
Socket 7 processors are not compatible with Socket 370 and they do not fit into the socket. There are no AMD processors compatible with this socket.

Compatible package types

370-pin Plastic Pin Grid Array (PPGA)
370-pin Flip-Chip Pin Grid Array (FC-PGA)
370-pin Flip-Chip Pin Grid Array with integrated heatspreader (FC-PGA2)

Installation instructions

For processor installation instructions please look at your motherboard manual, or follow installation instructions on Intel website.


Socket 370 configuration and specs

2007-10-20 14:53:50
Posted by: Hal

Thanks for this page! I've been looking for info of this type to decide on a Slot A to Socket 370 adapter for an old Dell project that I have. From what I've gleaned here, I think the $13.00 adapter and parts from the junk pile will allow me to turn a PII-650 into a PIII-FC-PGA2-1400MHz. Seems like a worthy shot. Thanks again.

Update to config/specs

2007-10-20 14:57:42
Posted by: Hal

In a previous attempt to comment, I wrote the wrong cpu types. My junk pile project is from a Slot 1 to a 370. Thanks.

Socket 370 possibilities

2008-01-01 15:33:06
Posted by: Christopher

Thankyou very much for this breakdown on the Socket 370 CPU family. I am presently looking to upgrade my CPU from the present 933Mhz I have.


2008-03-02 07:17:49
Posted by: Robert

What's tha diferrence between fcpga and fcpga2?

Response: FCPGA package doesn't have an integrated heatspreader, and FCPGA2 has it.

Socket 7 in socket 370 information.

2008-04-11 22:16:29
Posted by: Martyn B

I was just reading up some information for a mate, and i noticed some of the comments here. It may be of interest to someone that a AMD K6-2 (Socket 7) will if you snip off the correct pins will operate in a socket 370. Some people near where i lived threw out a socket 370 and the cpu was missing, my socket 7 AMD 350MHz was significantly faster than my P60 (which was a different socket again) so i was willing to take the chance. The chip got very hot but did seem to function ok for about 2 weeks until i developed the nasty habit of poking the reset terminals on the m/b with a screwdriver because i was too lazy to plug the reset button in. Anyway one day, i missed the terminals and shorted out a chip on the m/b and it never booted again hehehe.


2008-05-02 14:29:01
Posted by:

if you look the (poorly made) box i made you will see that one of the pins where it meets the CPU on the socket 7 is diomond like it is because they added a weird square thing on the pin about 3/4 of the way down so it looks like a regualr pin at first but it isnt

Socket 370

2011-09-27 12:46:37
Posted by: Wick

I currently work on fixing up older systems for crash kits. I was wondering thogh the socket 7 doesnt fit in the 370, can u do it vice versa... With a 370 in a socket 7?

Response: No, you cannot do that. Socket 7 and socket 370 CPUs are not interchangeable.
Last modified: 10 Mar 2014
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