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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).
Table 1. Voltage Requirements for Pentium® III Processors
| Nominal Core Voltage
(Volts) |
Core Speed (MHz) |
Form Factor |
Stepping |
| 2.05 V |
600, 600B |
S.E.C.C.2 |
kC0 |
| 2.00 V |
450, 500,
533, 550 |
S.E.C.C.2 |
kB0, kC0
|
| 1.76 V |
1B
GHz1,2 |
FC-PGA |
cC0 |
| 1.75 V |
866, 933,
1.0 B GHz1 |
FC-PGA |
cD0 |
| 1.70 V |
550E, 600E, 600EB,
650, 667, 700, 733, 750, 800, 800EB, 850, 866, 900, 933, 1
B GHz1 |
FC-PGA |
cC0 |
| 533EB, 550E, 600E,
600EB, 650, 667, 700, 733, 750, 800, 800EB, 850, 866, 933, 1
GHz1, 1B GHz1 |
S.E.C.C.2 |
cC0 |
| 933, 1 B GHz1 |
FC-PGA |
cB0 |
| 933, 1 GHz1,
1B GHz1 |
S.E.C.C.2 |
cB0 |
| 1.65
V |
533EB,
550E, 600E, 600EB, 650, 667, 700, 733, 750, 800, 800EB, 850,
866 |
S.E.C.C.2 |
cA2, cB0
|
| 533EB, 600E, 600EB,
650, 667, 700, 733, 750, 800, 800EB, 850, 866, 933 |
FC-PGA |
cA2, cB0 |
| 550E |
FC-PGA |
cB0 |
| 1.60 V |
500E |
FC-PGA |
cA2, cB0 |
| 500E |
FC-PGA |
cA2 |
| 1.475 V |
1.13, 1.20 GHz |
FC-PGA2 |
tA1 |
| 1.45 V |
1.13-S, 1.26-S, 1.40-S GHz |
FC-PGA2 |
tA1 |
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- 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, 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. For complete voltage
specifications for Pentium® III processors, refer to the Pentium®
III Processor Datasheet for the appropriate package type of
the processor.
This applies to:
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