[ The PC Guide | Systems and Components Reference Guide | The Processor | Processor Physical Characteristics | Processor Power and Voltage ]

Power and Voltage for Specific Processors

This section contains a summary table showing the voltage and power characteristics of the different processors. Look here for full details on any specific processor.

Note: A regular processor with a single entry for external and internal voltages is a single-voltage CPU, and one with separate entries is a dual-plane CPU. OverDrive CPUs with a different external and internal voltage represent OverDrives which include integrated voltage regulators.

Processor Family

Processor Version

External or I/O Voltage (V)

Internal or Core Voltage (V)

Power Management

8088

All

5

None

8086

All

5

None

80286

All

5

None

80386DX

All

5

None

80386SX

All

5

SMM on 80386SL only

80486DX

All

5

SMM in SL-enhanced versions

80486SX

All

5

SMM in SL-enhanced versions

80486DX2

Intel

5

SMM in SL-enhanced versions

AMD, Cyrix

3.3 (5V tolerant)

SMM

80486DX4

Intel

3.3

SMM

80486DX4

AMD, Cyrix

3.3 (5V tolerant)

SMM

AMD 5x86

--

3.45

SMM

Cyrix 5x86

All

3.45

SMM

Pentium

60, 66

5

SMM

75 to 200

3.3 (STD) / 3.52 (VRE)

Pentium OverDrive

63, 83, 120/133

5

3.3 (STD) / 3.52 (VRE)

SMM

125, 150, 166

3.3 (STD) / 3.52 (VRE)

Pentium with MMX

All

3.3

2.8

SMM

Pentium with MMX OverDrive

All

3.3

2.8 (3.3 from motherboard)

SMM

6x86

Regular

3.3

SMM

6x86L

3.3

2.8

K5

All

3.52

SMM

Pentium Pro

150

3.1

SMM

166, 180, All 200s

3.3

Pentium II

All

3.3

2.8

SMM

K6

166, 200

3.3

2.9

SMM

233

3.2

6x86MX

All

3.3

2.9

SMM

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