2System Board - (SiS Chipset) (Part Number:
SW2 Switch
This switch is used to select the internal CPU frequency by defining the CPU Bus Frequency / CPU Frequency ratio. If the processor is upgraded, the ratio might have to be changed to adapt to the new processor.
The following table includes some examples of the settings to use for different processor speeds:
Processor Speeds | Switch Block SW2 | Jumper J7 Settings | ||||
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| Ratio |
| 1 | 2 | CPU Bus | Pins Shorted |
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CPU Frequency 100 MHz | 2 / 3 |
| OFF | OFF | 66 MHz | 3 - 4 |
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CPU Frequency 120 MHz | 1 / 2 |
| ON | OFF | 60 MHz | 1 - 3 |
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CPU Frequency 133 MHz | 1 / 2 |
| ON | OFF | 66 MHz | 3 - 4 |
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CPU Frequency 150 MHz | 2 / 5 |
| ON | ON | 60 MHz | 1 - 3 |
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CPU Frequency 166 MHz | 2 / 5 |
| ON | ON | 66 MHz | 3 - 4 |
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The default settings for Switch 2 and Jumper J7 depend on the particular HP Vectra 500 Series PC model.
CPU Bus Frequency Jumper
This jumper (J7) defines the CPU bus frequency. The following illustration shows how to set the desired bus frequency.
1 | 1 | 1 |
4 | 4 | 4 |
3 | 3 | 3 |
50 MHz | 60 MHz | 66 MHz |
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