PB640 CPU Upgrade

Caution Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself 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.
 
Note
This motherboard can accommodate the following 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.

CPU Speed Jumper Settings

Clock Speed (J5J1)

CPU Multiplier (J5J2)

Host Bus Speed

CPU Speed

1-2, 4-5 1-2, 4-5 (x 1.5) 50 MHz 75 MHz
1-2, 5-6 1-2, 4-5 (x 1.5) 60 MHz 90 MHz
2-3, 4-5 1-2, 4-5 (x 1.5) 66 MHz 100 MHz
1-2, 5-6 2-3, 4-5 (x 2.0) 60 MHz 120 MHz
2-3, 4-5 2-3, 4-5 (x 2.0) 66 MHz 133 MHz
1-2, 5-6 2-3, 5-6 (x 2.5) 60 MHz *150 MHz
2-3, 4-5 2-3, 5-6 (x 2.5) 66 MHz *166 MHz

*Socket 7 only

If PCI Bus is set to:

ISA Clock Speed Override (J4K1)

25 1-2 (1/3 PCI Clock)
30 1-2 (1/3 PCI Clock)
33 2-3 (1/4 PCI Clock)