Asus p4b266 ASUS P4B266 motherboard user guide, 3.CPU frequency selection (SWITCH Switches 5-9)

3.CPU frequency selection (SWITCH Switches 5-9)

This option tells the clock generator what frequency to send the CPU. This allows the selection of the CPU’s external frequency (or Bus Clock). The BUS Clock multiplied by the Frequency Multiple equals the CPU’s internal frequency (the advertised CPU speed).

To select the CPU external frequency using the DIP switches, ensure that the JEN jumper is set to jumper mode.

SWITCH		9 10
		8
		7
		6
		5
		4
		3
	ON	1 2

CPU 100MHz

AGP 67MHz

PCI 33MHz

	9 10		9 10		9 10
			8		8
	8
			7		7
	7
	6		6		6
			5		5
	5
	4		4		4
	3		3		3
ON	1 2	ON	1 2	ON	1 2

105MHz 111MHz 120MHz

70MHz 74MHz 80MHz

35MHz 37MHz 40MHz

P4B266

P4B266 CPU

External Frequency Selection

	9 10		9 10		9 10
	8		8
					8
	7		7
					7
	6		6		6
	5		5		5
	4		4		4
	3		3		3
ON	1 2	ON	1 2	ON	1 2

CPU 120MHz		125MHz	133MHz
AGP	60MHz	62MHz	66MHz
PCI	30MHz	31MHz	33MHz

Set the CPU frequency only to the recommended settings. Frequencies other than the recommended CPU bus frequencies are not guaranteed to be stable.

ASUS P4B266 motherboard user guide 2-19