Hello,
This is a work in progress thing, since it’s not stable.
The Pentium on the compatibility pc card is a P54C socket 5 processor.
It runs on a 66MHz bus.
The Pentium has two inputs pins allowing the internal clock multiplier to be configured. Those pin are BF0 and BF1.
Both are pulled up to the 3.3V rail. This configuration is tue default 2/3 ratio, meaning the 66MHz system bus is multiplied by 3/2 or 1.5, giving us an almost 100MHz core clock.
On the PC Compatibility Card there is a marking for a R55 on the backside, just around CPU pin.
By soldering a small resistance (330 ohms max, as recommended by intel datasheet), you will obtain a x2 multiplier giving you a 133MHz clocked CPU.
Why you shouldn’t do this:
- PCI PC Compatibility are rare you don’t want to ruin them
- It’s designed for a 100MHz, the CPU is not meant to be overclocked not the power stage is designed for a 133MHz CPU
- It needs cooling as the CPU will get hotter
- It’s not tested enough
- It’s not stable enough
Unfortunately, I haven’t identified the resistor emplacement for the BF1 pin, pulling down BF1 will allow a x3 multiplier, the maximum, for a 200MHz CPU, the maximum without going with a P54C overdrive.
More to come…
This is a work in progress thing, since it’s not stable.
The Pentium on the compatibility pc card is a P54C socket 5 processor.
It runs on a 66MHz bus.
The Pentium has two inputs pins allowing the internal clock multiplier to be configured. Those pin are BF0 and BF1.
Both are pulled up to the 3.3V rail. This configuration is tue default 2/3 ratio, meaning the 66MHz system bus is multiplied by 3/2 or 1.5, giving us an almost 100MHz core clock.
On the PC Compatibility Card there is a marking for a R55 on the backside, just around CPU pin.
By soldering a small resistance (330 ohms max, as recommended by intel datasheet), you will obtain a x2 multiplier giving you a 133MHz clocked CPU.
Why you shouldn’t do this:
- PCI PC Compatibility are rare you don’t want to ruin them
- It’s designed for a 100MHz, the CPU is not meant to be overclocked not the power stage is designed for a 133MHz CPU
- It needs cooling as the CPU will get hotter
- It’s not tested enough
- It’s not stable enough
Unfortunately, I haven’t identified the resistor emplacement for the BF1 pin, pulling down BF1 will allow a x3 multiplier, the maximum, for a 200MHz CPU, the maximum without going with a P54C overdrive.
More to come…