Asus P5A WARNING, External, Internal, BUS Clock, 6.CPU to BUS Frequency Multiple (BF0, BF1, BF2), 5.CPU External (BUS) Frequency Selection (FS3, FS2, FS1, FS0)

III.INSTALLATION

5.CPU External (BUS) Frequency Selection (FS3, FS2, FS1, FS0)

These jumpers tell the clock generator what frequency to send to the CPU, chipset, and AGP. These allow the selection of the CPU’s External frequency (or BUS Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal fre- quency (the advertised CPU speed).

6.CPU to BUS Frequency Multiple (BF0, BF1, BF2)

These jumpers set the frequency ratio between the Internal frequency of the CPU and the External frequency (called the BUS Clock) within the CPU. These must be set in conjunction with the jumpers for CPU External (BUS) Frequency Selection.

ALLATION INST .III

Jumpers

P5A

Match the Mult. (Multiple) column of the table on the opposite page to these CPU types:

CPU A: AMD-K6-III,AMD-K6-2/400&faster

CPU B: AMD-K6-2/380&slower, AMD-K6

CPU C: Intel Pentium P54C, AMD-K5

CPU D: Intel Pentium P55C, IBM/Cyrix

6x86MX, IBM/Cyrix M II

CPU E: IBM/Cyrix 6x86, IBM/Cyrix 6x86L

CPU F: IDT WinChip 2™

1	FS3 FS2 FS1 FS0	FS3 FS2 FS1 FS0	FS3 FS2 FS1 FS0	FS3 FS2 FS1 FS0
2
3
CPU →	60MHz	66.8MHz	75MHz	75MHz
AGP →	60MHz	66.8MHz	75MHz	60MHz
PCI →	30MHz	33.4MHz	37.5MHz	30MHz
1
2
3
CPU →	83.3MHz	95MHz	100MHz	105MHz
AGP →	66.6MHz	63.3MHz	66.6MHz	70MHz
PCI →	33.3MHz	31.6MHz	33.3MHz	35MHz
1
2
3
CPU → 110MHz		115MHz	120MHz
AGP → 73MHz		77.6MHz	80MHz
PCI → 36.6MHz		38.3MHz	40MHz

CPU External Clock (BUS) Frequency Selection

	BF0 BF1 BF2			BF0 BF1 BF2			BF0 BF1 BF2			BF0 BF1 BF2
1
2
3
CPU A →3.5x(7/2)				6.0x(6/1)			2.5x(5/2)			3.0x(3/1)
CPU B →3.5x(7/2)				2.0x(2/1)			2.5x(5/2)			3.0x(3/1)
CPU C →1.5x(3/2)				2.0x(2/1)			2.5x(5/2)			3.0x(3/1)
CPU D →3.5x(7/2)				2.0x(2/1)			2.5x(5/2)			3.0x(3/1)
CPU E →3.0x(3/1)				2.0x(2/1)			1.0x(1/1)				—
CPU F →3.5x(7/2)			3.33x(10/3)				2.5x(5/2)			3.0x(3/1)
1	BF0 BF1 BF2			BF0 BF1 BF2			BF0 BF1 BF2			BF0 BF1 BF2
2
3
CPU A → 4.0x(4/1)			4.5x(9/2)				5.0x(5/1)		5.5x(11/2)
CPU B →	4.0x(4/1)		4.5x(9/2)				5.0x(5/1)		5.5x(11/2)
CPU C →		—			—			—			—
CPU D →		—			—			—			—
CPU E →		—			—			—			—
CPU F →	4.0x(4/1)		4.5x(9/2)			2.33x(7/3)			2.66x(8/3)

CPU : BUS Frequency Multiple

WARNING! Frequencies above 100MHz exceed the specifications for the onboard chipset and are not guaranteed to be stable. The table on the following page is for general reference purposes only. Always refer to the instructions included with your CPU when possible.

16 ASUS P5A User’s Manual