Hardware Reference
In-Depth Information
Appendix F Processor sockets
Socket 1
Found on 486 motherboards and supports 486 chips, plus the DX2, DX4 Overdrive.
Socket 2
An upgrade of Socket 1 which has 238 pins and accepts the 486 processor but can also support a
Pentium Overdrive.
Socket 3
Similar to Socket 2 but has 237 pins. Operates at 5 V but can be configured for 3.3 V operation.
Socket 4
Supports older Pentium 60-66 and Overdrive processors that operate from a 5 V supply.
Socket 5
Supports Pentium processors from 75 to 133 MHz operating from a 3.3 V supply. Newer chips
will not fit because they need an extra pin. Socket 5 has been replaced by Socket 7 although
socket converters are available that allow Socket 7 processors to be fitted in Socket 5
motherboards.
Socket 6
A slightly more advanced Socket 3 with 235 pins and 3.3 V operation to suit some 486 chips.
Socket 7
Operating at 2.5 to 3.3 V, Socket 7 is currently the most common motherboard socket still in use.
Socket 7 supports Pentium processors from 75 MHz and above, MMX processors, the
AMD K5, K6, K6-2, K6-3, 6 86, M2 and M3, and Pentium MMX Overdrives. This socket
was the industry standard being suitable for sixth-generation chips by IDT, AMD, and Cyrix.
Intel abandoned the socket for its sixth-generation lineup in favour of Slot 1 (see below).
Socket 8
Supports the Pentium Pro. Other modern Pentium Processors do not use Socket 8 but use Slots.
Slot 1
Slot 1 supports the P2, P3, and Celeron processors. A Pentium Pro can be fitted by using a
Socket 8 on a daughtercard which is then fitted into the Slot 1.
Slot 2
Slot 2 is a 330 pin version of Slot 1. The Slot 2 design allows the processor to communicate
with the level 2 cache at the CPU's full clock speed, in contrast to Slot 1 which communicates
at half that speed.
Slot A
Similar to Slot 1, this design suits the AMD Athlon processor. It uses a different bus protocol
(EV6) to support a 200 MHz front side bus (FSB).
Socket 370
Socket 370 is a Socket 7 with an extra row of pins on all four sides. Socket 370 supports the
Pentium III, Celeron, and Celeron II processors.
Socket 462
Socket 462 is also known as Socket A and is used for AMD's Athlon and Duron processors.
It supports the 200 MHz EV6 bus, as well as the new 266 MHz EV6 bus.
Socket
Socket 423 is the original socket used by Pentium 4 processors. Socket 478 supports the
423/478
newer 478-pin Pentium 4's.
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