Specifications

Computer Architecture and Maintenance (G-Scheme-2014)

Installing a Pentium III processor in the FC-PGA package into an older motherboard

is unlikely to damage the motherboard. However, the processor itself could be

damaged. Pentium III processors in the 0.18-micron process operate at either 1.60V or

1.65V, whereas the Intel Celeron processors operate at 2.00V. The motherboard could

be damaged if the motherboard BIOS fails to recognize the voltage identification of the

processor. Contact your PC or motherboard manufacturer before installation to ensure

compatibility.

A motherboard with a Slot 1 can be designed to accept almost any Celeron, Pentium II,

or Pentium III processor. To use the socketed Celerons and Pentium III processors,

several manufacturers have made available a low-cost slot-to-socket adapter sometimes

called a slot-ket. This is essentially a Slot 1 board containing only a Socket 370, which

enables you to use a PGA processor in any Slot 1 board. A typical slot-ket adapter is

shown in the "Celeron" section later in this chapter.

Socket 423

Socket 423 is a ZIF-type socket introduced in November 2000 for the original Pentium

4. Figure . shows Socket 423.

Figure. Socket 423 (Pentium 4) showing pin 1 location.

Socket 423 supports a 400MHz processor bus, which

connects the processor to the Memory Controller Hub

(MCH), which is the main part of the motherboard

chipset and similar to the North Bridge in earlier

chipsets. Pentium 4 processors up to 2GHz were

available for Socket 423; all faster versions require

Socket 478 instead.

Socket 423 uses a unique heatsink mounting method that requires standoffs attached

either to the chassis or to a special plate that mounts underneath the motherboard. This

was designed to support the weight of the larger heatsinks required for the Pentium 4.

Because of this, many Socket 423 motherboards require a special chassis that has the

necessary additional standoffs installed. Fortunately, the need for these standoffs was

eliminated with the newer Socket 478 for Pentium 4 processors.

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