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| Caution | Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system themselves should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty. |
Information
This motherboard can accommodate the following CPUs:
Intel MMX Pentium 166 MHz
Intel MMX Pentium 200 MHz
Intel MMX Pentium 233 MHz
Note
This motherboard can also accommodate the following non-MMX CPUs:
| Intel Pentium 75 MHz | Intel Pentium 133 MHz | ||
| Intel Pentium 90 MHz | Intel Pentium 150 MHz | ||
| Intel Pentium 100 MHz | Intel Pentium 166 MHz | ||
| Intel Pentium 120 MHz | Intel Pentium 200 MHz | ||
| Uses the 321-pin Type 7 Zero Insertion Force (ZIF) CPU Socket | |||
| Supports the Pentium OverDrive Processor. | |||
| Not keyboard switchable. | |||
| Disable cache to slow down the system. | |||
| Clock Speed(J1F2C) | CPU Multiplier(J1F2D) | Clock Speed | Multiplier | CPU Speed |
|---|---|---|---|---|
| 2-3, 5-6 | 1-2, 4-5 | 50MHz | x 1.5 | 75MHz |
| 2-3, 4-5 | 1-2, 4-5 | 60MHz | x 1.5 | 90MHz |
| 1-2, 5-6 | 1-2, 4-5 | 66MHz | x 1.5 | 100MHz |
| 2-3,4-5 | 2-3, 4-5 | 60MHz | x 2.0 | 120MHz |
| 1-2, 5-6 | 2-3, 4-5 | 66MHz | x 2.0 | 133MHz |
| 2-3, 4-5 | 2-3, 5-6 | 60MHz | x 2.5 | 150MHz |
| 1-2, 5-6 | 2-3, 5-6 | 66MHz | x 2.5 | 166MHz |
| 1-2, 5-6 | 1-2, 5-6 | 66MHz | x 3.0 | 200MHz |
| 1-2, 5-6 | 1-2, 4-5 | 66MHz | x 1.5 | 233MHz |
Note
On later PB680 motherboards an enginering revision was made that removed pins 1 and 4 from jumper J1F2D.
Below are the correct settings for CPU multiplier speeds. Other jumper settings remain the same.
| CPU Multiplier(J1F2D) | 2-3 | 5-6 |
|---|---|---|
| 1.5x | Off | Off |
| 2.0x | On | Off |
| 2.5x | On | On |
| 3.0x | Off | On |