Intel® Pentium® III Processors are specified to operate at the voltages provided in the table below. It is important to verify that the motherboard explicitly supports the specific processor (by stepping and speed).
Voltage requirements for Intel® Pentium III Processors
|Nominal Core Voltage (Volts)
||Core Speed (MHz)
||450, 500, 533, 550
||kB0, kC0 |
||866, 933, 1.0 B GHz1
||550E, 600E, 600EB, 650, 667, 700, 733, 750, 800, 800EB, 850, 866, 900, 933, 1 B GHz1
|533EB, 550E, 600E, 600EB, 650, 667, 700, 733, 750, 800, 800EB, 850, 866, 933, 1 GHz1, 1B GHz1
|933, 1 B GHz1
|933, 1 GHz1, 1B GHz1
||533EB, 550E, 600E, 600EB, 650, 667, 700, 733, 750, 800, 800EB, 850, 866
||cA2, cB0 |
|533EB, 600E, 600EB, 650, 667, 700, 733, 750, 800, 800EB, 850, 866, 933
||1.13, 1.20 GHz
||1.13-S, 1.26-S, 1.40-S GHz
- Note that 1 GHz = 1000 MHz.
- This only affects processors with the s-spec, SL4WM. The SL4WM s-spec has a VID request of 1.70V, however, the processor should be supplied 1.76V at the PGA Vcc pins.
- The -S version of the Pentium III processor requires VRM 8.5.
Proper voltage must be supplied for reliable operation. It may be supplied by a regulator integrated in the motherboard, or by a voltage regulator module (VRM) installed in Header 8 on the motherboard.
If the regulator is integrated in the motherboard, it must be Voltage ID (VID) programmable to allow the processor to program the correct voltage during power-on.
If the motherboard has Header 8, a VRM must be installed in the header to power the processor. Most VRMs are VID-programmable. If your motherboard has a fixed-voltage VRM, its output voltage must match the processor requirements.
Since the operating voltage of Intel® Pentium® III Processors may be changed as the processor goes through stepping changes, VID-programmable voltage regulators are the preferred solution. For complete voltage specifications for Intel® Pentium® III Processors, refer to the Intel® Pentium III Processor Datasheet for the appropriate package type of the processor.
This applies to: