Specifications

Computer Architecture and Maintenance (G-Scheme-2014)

The processor uses five voltage ID (VID) pins to signal the VRM built into the

motherboard to deliver the correct voltage for the particular CPU you install. This

makes the voltage selection completely automatic and foolproof. Most Pentium 4

processors for Socket 423 require 1.7V. A small triangular mark indicates the pin-1

corner for proper orientation of the chip.

Socket 478

Socket 478 is a ZIF-type socket for the Pentium 4 and Celeron 4 (Celerons based on the

Pentium 4 core) introduced in October 2001. It was specially designed to support

additional pins for future Pentium 4 processors and speeds over 2GHz. The heatsink

mounting is different from the previous Socket 423, allowing larger heatsinks to be

attached to the CPU. Figure. shows Socket 478.

Figure. Socket 478 (Pentium 4) showing pin 1

location.

Socket 478 supports a 400MHz, 533MHz, or 800MHz

processor bus that connects the processor to the

memory controller hub (MCH), which is the main

part of the motherboard chipset.

Socket 478 uses a heatsink attachment method that

clips the heatsink directly to the motherboard, and not the CPU socket or chassis (as

with Socket 423). Therefore, any standard chassis can be used, and the special standoffs

used by Socket 423 boards are not required. This heatsink attachment allows for a

much greater clamping load between the heatsink and processor, which aids cooling.

Socket 478 processors use five VID pins to signal the VRM built into the motherboard

to deliver the correct voltage for the particular CPU you install. This makes the voltage

selection completely automatic and foolproof. A small

triangular mark indicates the pin-1 corner for proper

orientation of the chip.

Socket A (Socket 462)

AMD introduced Socket A, also called Socket 462, in June

2000 to support the PGA versions of the Athlon and Duron

processors. It is designed as a replacement for Slot A used by

the original Athlon processor. Because the Athlon has now

Prepared By – Prof. Manoj.kavedia (9860174297 – 9324258878 ) (www.kavediasir.yolasite.com)