Central Processing Units

Starting with 486 processors the design of Microprocessors or Central Processing Units (CPUs) sockets and slots was standardised to the extent that different models of the same basic processor are interchangable. This means that it is relatively straightforward to replace a faulty processor, assuming that there are no problems elsewhere (a burnt out processor may correspond to damage elsewhere on the motherboard).

CPU Socket Specifications
Socket Number Pins Pin Layout Voltage Supported Processors
Socket 1 169 17×17 PGA 5v 486 SX/SX2, DX/DX2, DX4 OverDrive
Socket 2 238 19×19 PGA 5v 486 SX/SX2, DX/DX2, DX4 OverDrive, 486 Pentium OverDrive
Socket 3 237 19×19 PGA 5v/3.3v 486 SX/SX2, DX/DX2, DX4, 486 Pentium OverDrive, 5x86
Socket 4 273 21×21 PGA 5v Pentium 60/66, OverDrive
Socket 5 320 37×37 SPGA 3.3v/3.5v Pentium 75-133, OverDrive
Socket 6 235 19×19 PGA 3.3v 486 DX4, 486 Pentium OverDrive
Socket 7 321 37×37 SPGA VRM Pentium 75-266+, MMX, OverDrive, 6x86, K6
Socket 8 387 dual pattern SPGA Auto VRM Pentium Pro
Socket PGA370 370 37×37 SPGA Auto VRM PGA Celeron, future PIII
Slot 1 242 SEC/SEP Auto VRM Pentium II, SEP Celeron, Pentium III
Slot 2/SC330 330 SEC Slot Auto VRM Pentium II Xeon, Pentium III Xeon

The speed of these CPUs is slow compared with CPUs in modern PCs. An upgrade could be accomplished through replacing the motherboard together with the CPU.

Amazon Books
Image of CPU Design: Answers to Frequently Asked Questions
Author: Chandra M. R. Thimmannagari
Publisher: Springer US (2010)
Binding: Paperback, 252 pages