HP 520 5/XX, 525 5/XX SW2 Switch, CPU Bus Frequency Jumper, Processor Speeds, Jumper J7 Settings

2System Board - (SiS Chipset) (Part Number: D4051-63001) SiS Chipset

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
		Position
	Ratio		1	2	CPU Bus	Pins Shorted
					Frequency
CPU Frequency 100 MHz	2 / 3		OFF	OFF	66 MHz	3 - 4
CPU Frequency 120 MHz	1 / 2		ON	OFF	60 MHz	1 - 3
CPU Frequency 133 MHz	1 / 2		ON	OFF	66 MHz	3 - 4
CPU Frequency 150 MHz	2 / 5		ON	ON	60 MHz	1 - 3
CPU Frequency 166 MHz	2 / 5		ON	ON	66 MHz	3 - 4

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 4

3

1

4 3

1 4

3

50 MHz 60 MHz 66 MHz

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