2 System Board
Devices on the
Bus Frequencies | The location of the system board switches is shown in the diagram on page |
| 20. Five of these switches |
| frequencies of the PC, and the three frequency multipliers (M1, M2 and M3), |
| as summarized in the table below. The uses of the other switches are |
| summarized on page 39. |
There is a 14.318 MHz crystal oscillator on the system board whose frequency is multiplied, by a phase locked loop, to 50, 60 or 66 MHz for the Processor Local (PL) bus, according to the settings of
2.5or 3, according to the settings of
You will need to change these switches when you replace the original system board, for a repair, so as to match the processor. You will not need to change the switches if you upgrade the original processor using the correct Intel Overdrive. It is not recommended to upgrade to another processor that may have different voltage requirements.
Processor | M1 | PL Bus | M2 | PCI Bus | M3 | ISA Bus | PL Frequency | Multiplier M1 | M3 | VRM1 | ||||
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75 MHz2 | 1.5 | 50 MHz | 2 | 25 MHz | 3 | 8.33 MHz | Closed | Closed | Closed | Open | Open | Open | Vcc | |
90 MHz2 | 1.5 | 60 MHz | 2 | 30 MHz | 4 | 7.5 MHz | Closed | Open | Closed | Open | Open | Closed | Vcc | |
100 MHz2 | 1.5 | 66 MHz | 2 | 33 MHz | 4 | 8.25 MHz | Open | Closed | Closed | Open | Open | Closed | Vcc | |
120 MHz2 | 2 | 60 MHz | 2 | 30 MHz | 4 | 7.5 MHz | Closed | Open | Closed | Closed | Open | Closed | Vcc,Vre | |
133 MHz | 2 | 66 MHz | 2 | 33 MHz | 4 | 8.25 MHz | Open | Closed | Closed | Closed | Open | Closed | Vcc | |
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150 MHz | 2.5 | 60 MHz | 2 | 30 MHz | 4 | 7.5 MHz | Closed | Open | Closed | Closed | Closed | Closed | Vcc,Vmmx | |
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166 MHz | 2.5 | 66 MHz | 2 | 33 MHz | 4 | 8.25 MHz | Open | Closed | Closed | Closed | Closed | Closed | Vre,Vmmx | |
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200 MHz | 3 | 66 MHz | 2 | 33 MHz | 4 | 8.25 MHz | Open | Closed | Closed | Open | Closed | Closed | Vre,Vmmx | |
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233 MHz2 | 3.5 | 66 MHz | 2 | 33 MHz | 4 | 8.25 MHz | Open | Closed | Open | Open | Open | Closed | Vmmx |
1.Where there is a choice indicated, install the one that is appropriate for the given processor.
2.These processors are not available for these models of HP Vectra PC at the time of printing. This information is provided for completeness only.
The computer may execute erratically, if at all, or may overheat, if it is configured to operate at a higher processor speed than the processor is capable of supporting. This can cause damage to the computer.
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