Slot 1
From Wikipedia, the free encyclopedia
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| Type | Slot |
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| Chip form factors |
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| Contacts | 242[1] |
| FSB protocol | GTL+ |
| FSB frequency | 66, 100, and (on third-party chipsets) 133 MHz |
| Voltage range | 1.3 to 3.50 V |
| Processors | Pentium II: 233–450 MHz Celeron: 266–433 MHz |
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This article is part of the CPU socket series |
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Slot 1 refers to the physical and electrical specification for the connector used by some of Intel's microprocessors, including the Pentium Pro, Celeron, Pentium II and the Pentium III. Both single and dual processor configurations were implemented.
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[edit] General
With the introduction of the Pentium II CPU, the transition from socket to slot had become necessary, because the CPU's core and the cache are two different chips on a shared circuit board.
There are certain converter-cards called Slotkets, which are plugged into the slot, which contain a Socket 8 to allow Pentium Pro CPUs to be used on Slot 1 motherboards.[2] These specific converters, however, are rare.
Aside from these converters there are those who contain a Socket 370, which are built to support the newer CPUs for this socket. Many of these are equipped with own voltage regulator modules, which are used, to supply the new CPUs with their needed (lower) core voltage, which the motherboard does not support.
With the new Slot 1, Intel supports Symmetric multiprocessing. A maximum of two Pentium-II or Pentium-III CPUs can be used in a dual-motherboard. The Celeron does not have official SMP-support.
The mechanic connector-slot SC242 used for Slot 1 was later used also for the Slot A by AMD. To prevent accidentally installing the wrong chip (the two slots are compatible mechanically, but NOT electrically), it was turned around 180 degrees on Slot A motherboards.
[edit] Form Factors
The SECC-form (Single Edge Contact Cartridge) was used at the beginning of the Slot-1-era in Pentium II CPUs. In this method the CPU itself is embedded into a plastic and metal hybrid case. The back of the housing is made of plastic and has several writings on it: „Pentium II“, the Intel company logo, a hologram and the model number. The front consists of a black anodized aluminium plate, which is used as a holding plate for the CPU cooler. The SECC form is very solid, because the CPU itself is resting safely inside the case. Opposed to socket-based CPUs, there aren't any pins that can be bent, nor is there a way to damage the CPU by wrong installation of a cooler.
After SECC, the SEPP-form (Single Edge Processor Package) appeared on the market. It was designed for the lower-priced Celeron CPUs. This form lacked a case.
The Pentium III processors had a case again, called SECC2. The only thing that has succeeded from the old SECC-form is the backplate. The CPU lies now free and just like with the Celeron CPUs, the cooler lies on the core directly.
[edit] History
Historically, there are three platforms for the Intel P6-CPUs: Socket 8, Slot 1 and Socket 370.
The Slot 1 is a successor to the Socket 8. While the Socket 8 CPUs (Pentium Pro) directly had the L2-cache embedded into the CPU, it is located (outside of the core) on a circuit board shared with the core itself. The exception here are the later Slot 1 CPUs with the Coppermine core which have the L2-Cache embedded into the die.
In the beginning of 2000, while the Pentium-III-CPUs with FC-PGA-housing appeared, the Slot 1 was slowly succeeded by the Socket 370, after Intel had already offered the Socket 370 and Slot 1 at the same time since the beginning of 1999. The socket 370 was initially made for the low-cost Celeron processors, while the Slot 1 was thought of as a platform for the expensive Pentium II and early Pentium III models. Cache and core were both embedded into the die.
The Slot 1 also obsoleted the old Socket 7, at least regarding Intel, as the standard platform for the home-user. After abandoning the Intel Pentium MMX CPU, Intel completely left the Socket 7 market to the manufacturers AMD, Cyrix and IDT.
[edit] Chipsets on Slot 1 motherboards and officially supported CPUs [3] [4]
[edit] Intel 440FX [5]
- Introduced in: May 6th 1996
- FSB: 66 MHz
- Supported RAM types: EDO-DRAM
- Supported CPUs:
- Pentium Pro
- Pentium II with 66 MHz FSB
- Celeron (Covington, Mendocino)
- Note:
[edit] Intel 440LX [6]
- Introduced in: August 27th 1997
- FSB: 66 MHz
- Supported RAM types: SDRAM
- Supported CPUs:
- Pentium II with 66 MHz FSB
- Celeron (Covington, Mendocino)
- Note:
[edit] Intel 440BX [7]
- Introduced in: April 1998
- FSB: 66 and 100 MHz (many motherboards supported overclocking to 133 MHz, allowing usage of Socket 370 CPUs using a Slocket)
- Supported RAM types: SDRAM (PC66 and PC100 (PC133 with overclocking)
- Supported CPUs:
- Pentium II with 66 and 100 MHz FSB
- Pentium III with 100 MHz FSB (133 with overclocking)
- Celeron (Covington, Mendocino, Coppermine)
[edit] Via Apollo Pro 133A
- Introduced in: 2000
- FSB: 66, 100, and 133 MHz
- AGP 4x Modus
- Supported CPUs: All Slot 1 CPUs
Not only with some motherboards using the Intel 440BX chipset, as noted above, but also with other chipsets of third-party developers, usage of socketed Celerons and Pentium IIIs was possible by using a suitable slocket.
[edit] Pentium III EB support on Slot 1 motherboards
A special series of Pentium III for Slot 1 had an addition to its name (Pentium III EB). The "E" stands for the Coppermine-core and the "B" stands for a 133 MHz FSB. Ironically, no consumer-oriented Intel chipset officially supports a FSB of 133 MHz. To use this CPU, one must either use the VIA Apollo Pro 133A chipset, use an Intel 800-series chipset (which was relatively expensive and often required RDRAM, limiting it to high-end workstations or servers), or use the Intel 440BX outside of its specifications (which, on some motherboards, is indeed possible with stability).
[edit] See also
[edit] References
- ^ "CPU Sockets Chart". erols.com. http://users.erols.com/chare/sockets.htm. Retrieved 2009-03-31.
- ^ Experience of Pentium Pro on Slot 1 motherboard usage
- ^ List of Intel Chipsets
- ^ List of VIA chipsets
- ^ Intel Corporation: 440FX PCIset Datasheet
- ^ Intel Corporation: 440LX AGPset Design Guide
- ^ Intel Corporation: 440BX AGPset Design Guide
[edit] External links
- Picture of a Socket 8 to Slot 1 Slocket adapter
- Intel's specifications for the SC242 connectors
- Intel's detailed Slot 1 CPU (Coppermine) information, including Slot 1 pinout
- An image of a motherboard with Slot 1 connector
- An image of a Pentium II processor
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