UPGRADING REPAIRING PCs

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Chapter 2—System Components and Configuration
Use Tables 2.5 and 2.6 to help determine which processors may fit
in place of your existing CPU. Note that a replacement CPU must
have the same pinout, the same electrical requirements, and be
compatible with your motherboard. Many vendors sell upgradecompatible
processor versions, which have been modified from
their original forms by adding a voltage regulator and other support
options.
Table 2.5 Intel and Compatibles 486/Pentium-Class CPU Socket
Types and Specifications
Socket Supported
Number Pins Pin Layout Voltage Processors
Socket 1 169 17×17 PGA 5v 486 SX/SX2, DX/DX21 ,
DX4 OverDrive
Socket 2 238 19×19 PGA 5v 486 SX/SX2, DX/DX21 ,
DX4 OverDrive, 486
Pentium OverDrive
Socket 3 237 19×19 PGA 5v/3.3v 486 SX/SX2, DX/DX2,
DX4, 486 Pentium
OverDrive, AMD 5x86,
Cyrix 5x86
Socket 4 273 21×21 PGA 5v Pentium 60/66,
OverDrive
Socket 5 320 37×37 SPGA 3.3/3.5v Pentium 75-133,
OverDrive
Socket 62 235 19×19 PGA 3.3v 486 DX4, 486 Pentium
OverDrive
Socket 7 321 37×37 SPGA VRM Pentium 75-233+, MMX,
OverDrive, AMD K5/K6,
Cyrix M1, VIA Cyrix MII
Socket 8 387 dual pattern SPGA Auto VRM Pentium Pro
PGA370 370 37×37 SPGA 2.0v Celeron, Pentium III, VIA
Cyrix III
Slot 1 242 Slot Auto VRM Pentium II/III, Celeron
Slot 2 330 Slot Auto VRM Pentium II Xeon/
Pentium III Xeon
Slot A 242 Slot Auto VRM AMD Athlon (K7) SECC
Socket A 462 SPGA Auto VRM AMD Duron/AMD
Athlon PGA
1. Non-overdrive DX4 or AMD 5x86 also can be supported with the addition of an aftermarket
3.3v voltage-regulator adapter.
2. Socket 6 was a paper standard only and was never actually implemented in any systems.
PGA = Pin Grid Array.
SPGA = Staggered Pin Grid Array.
VRM = Voltage Regulator Module.