This page is being provided as the voltage requirements of Processors is now one of the most important factors in upgrading. This page
should enable the upgrader to compare the core voltages of processors against those supported by particular motherboards.
Socket 7 CPU's
Intel Pentium, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| P 75 |
3.5v |
3.5v |
| P 90 |
3.5v |
3.5v |
| P 100 |
3.5v |
3.5v |
| P 120 |
3.5v |
3.5v |
| P 133 |
3.5v |
3.5v |
| P 150 |
3.5v |
3.5v |
| P 166 |
3.5v |
3.5v |
| P 200 |
3.5v |
3.5v |
Intel Pentium MMX, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| P 166MMX |
2.8v |
3.3v |
| P 200MMX |
2.8v |
3.3v |
| P 233MMX |
2.8v |
3.3v |
AMD K5, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| PR 75 |
3.5v |
3.5v |
| PR 90 |
3.5v |
3.5v |
| PR 100 |
3.5v |
3.5v |
| PR 120 |
3.5v |
3.5v |
| PR 133 |
3.5v |
3.5v |
| PR 166 |
3.5v |
3.5v |
AMD K6, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| K6 166 |
2.9v |
3.3v |
| K6 200 |
2.9v |
3.3v |
| K6 233 |
3.2v |
3.3v |
| K6 266 |
2.2v |
3.3v |
| K6 300 |
2.2v |
3.45v |
AMD K6-2, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| K6-2 266 |
2.2v |
3.3v |
| K6-2 300 |
2.2v |
3.3v |
| K6-2 333 |
2.2v |
3.3v |
| K6-2 350 |
2.2v |
3.3v |
| K6-2 366 |
2.2v |
3.3v |
| K6-2 380 |
2.2v |
3.3v |
| K6-2 400 |
2.2v |
3.3v |
AMD K6-3, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| K6-3 400 |
2.4v |
3.3v |
| K6-3 450 |
2.4v |
3.3v |
Cyrix 6x86, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| PR 75 |
3.5v |
3.5v |
| PR 90 |
3.5v |
3.5v |
| PR 100 |
3.5v |
3.5v |
| PR 120 |
3.5v |
3.5v |
| PR 133 |
3.5v |
3.5v |
Cyrix 6x86L, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| PR 90 |
2.8v |
3.3v |
| PR 100 |
2.8v |
3.3v |
| PR 120 |
2.8v |
3.3v |
| PR 133 |
2.8v |
3.3v |
| PR 150 |
2.8v |
3.3v |
| PR 166 |
2.8v |
3.3v |
| PR 200 |
2.8v |
3.3v |
Cyrix 6x86MX & MII, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| PR 166 |
2.9v |
3.3v |
| PR 200 |
2.9v |
3.3v |
| PR 233 |
2.9v |
3.3v |
| PR 266 |
2.9v |
3.3v |
| PR 300 |
2.9v |
3.3v |
| PR 333 |
2.9v |
3.3v |
Socket 8 CPU's
Intel Pentium Pro, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| P Pro 166 |
3.3v |
3.3v |
| P Pro 180 |
3.3v |
3.3v |
| P Pro 166 |
3.3v |
3.3v |
Slot 1/Socket 370 CPU's
Intel Pentium II, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| PII 233 |
2.8v |
3.3v |
| PII 266 |
2.8v |
3.3v |
| PII 300 |
2.8v |
3.3v |
| PII 333 |
2.0v |
3.3v |
| PII 350 |
2.0v |
3.3v |
| PII 400 |
2.0v |
3.3v |
| PII 450 |
2.0v |
3.3v |
Intel Celeron, Voltage Data
| Processor |
Core Voltage |
I/O Voltage |
| Celeron 266 |
2.0v |
3.3v |
| Celeron 300 |
2.0v |
3.3v |
| Celeron 333 |
2.0v |
3.3v |
| Celeron 366 |
2.0v |
3.3v |
| Celeron 400 |
2.0v |
3.3v |
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