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There are two common interfaces for CPU's, Socket 7 and Slot 1. Socket 7 is the most commonly used. All Pentiums use it, along with all Cyrix and AMD chips. Slot 1 is the Single Edge Contact (SEC) interface used by the Pentium II family of processors.

Processor External Voltage Core Voltage
8088 5 5
8086 5 5
80286 5 5
80386SX (DX) 5 5
80486DX (SX) 5 5
Intel 486DX2 5 5
AMD, Cyrix 486DX2 3.3 3.3
486DX4 (All makes) 3.3 3.3
5x86 (AMD, Cyrix) 3.45 3.45
Pentium 60, 66 5 5
Pentium 75-200 3.3/3.52 3.3/3.52
Pentium MMX 3.3 2.8
6x86 3.3 3.3
6x86L 3.3 2.8
AMD K5 3.52 3.52
Pentium Pro-150 3.1 3.1
Pentium Pro-166+ 3.3 3.3
Pentium II (Klamath) 3.3 2.8
Pentium II Deschutes/ Celeron/ Xeon 3.3 2.0
AMD K6-2 w/ 3DNow! 3.3 2.2
AMD K6 266/ 300 3.3 2.2
AMD K6-(166,200) 3.3 2.9
AMD K6-233 3.3 3.2
6x86L 3.3 2.8
6x86MX 3.3 2.9

Source: www.techrepublic.com

Last modified: January 10, 2005
Yannis Grammatis