World Magazine 2024
Voltage Requirements for Pentium III Processors
| Core Speed | Core Voltage | ||
| Minimum | Nominal | Maximum | |
| 450 MHz | 1.93V | 2.00V | 2.07V |
| 500 MHz | 1.93V | 2.00V | 2.07V |
| 500E MHz | 1.52V | 1.60V | 1.64V |
| 533B MHz | 1.98V | 2.05V | 2.12V |
| 533EB MHz | 1.57V | 1.65V | 1.69V |
| 550 MHz | 1.93V | 2.00V | 2.07V |
| 550E MHz | 1.52V | 1.60V | 1.64V |
| 600 MHz | 1.98V | 2.05V | 2.12V |
| 600B MHz | 1.98V | 2.05V | 2.12V |
| 600E MHz | 1.57V | 1.65V | 1.69V |
| 600EB MHz | 1.57V | 1.65V | 1.69V |
| 650 MHz | 1.57V | 1.65V | 1.69V |
| 667 MHz | 1.57V | 1.65V | 1.69V |
| 700 MHz | 1.57V | 1.65V | 1.69V |
| 733 MHz | 1.57V | 1.65V | 1.69V |
| 750 MHz | 1.57V | 1.65V | 1.69V |
| 800 MHz | 1.57V | 1.65V | 1.69V |
| 800EB MHz | 1.57V | 1.65V | 1.69V |
| 850 MHz | 1.57V | 1.65V | 1.69V |
| 866 MHz | 1.57V | 1.65V | 1.69V |
| 1.0 GHz* | 1.62V | 1.70V | 1.74V |
* Note that 1.0 GHz = 1000 MHz
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, then 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 Pentium III processors may be changed as the processor goes through stepping changes, VID-programmable voltage regulators are the preferred solution.
