Asus TXP4-X III.INSTALLATION, ASUS TXP4-XUser’s Manual, 5.CPU to BUS Frequency Ratio (BF0, BF1, BF2), 4.CPU External (BUS) Frequency Selection (FS0, FS1, FS2)

III.INSTALLATION4.CPU External (BUS) Frequency Selection (FS0, FS1, FS2)

These jumpers tell the clock generator what frequency to send to the CPU. 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 frequency (the advertised CPU speed).

5.CPU to BUS Frequency Ratio (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 together with the above jumpers CPU External (BUS) Frequency Selection.

FS0FS1FS2

1

2

3 50MHz

CPU External BF2 BF1

FS2 FS1 FS0	FS2 FS1 FS0
	1
	2
	3

	55MHz	60MHz
Clock (BUS) Frequency
BF0	BF2 BF1 BF0	BF2 BF1

FS0FS1FS2

1 1

2 2

3 3

	66MHz
Selection
BF0	BF2 BF1 BF0

		1	1	1	1
		2	2	2	2
Complete Names:		3	3	3	3
Intel Pentium P54C, P55C-MMX	P54C/K5	1.5x(3/2)	2.0x(2/1)	2.5x(5/2)	3.0x(3/1)
AMD K5, K6	P55C/K6/MX	3.5x(7/2)	2.0x(2/1)	2.5x(5/2)	3.0x(3/1)
IBM/Cyrix 6x86(M1), 6x86MX(M2)	IBM/Cyrix 6x86	3.0x(3/1)	2.0x(2/1)	2.0x(2/1)	4.0x(4/1)

CPU : BUS Frequency Ratio

Set the jumpers by the Internal speed of the Intel, AMD, IBM, or Cyrix CPU as follows:

CPU Model	Freq.				(BUS Freq.)			(Freq. Ratio)
		Ratio	BUS Freq.	FS2		FS1	FS0	BF1	BF0
Intel Pentium	233MHz	3.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
Intel Pentium	200MHz	3.0x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [1-2]
Intel Pentium	166MHz	2.5x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [2-3]
Intel Pentium	150MHz	2.5x	60MHz	[2-3]		[2-3]	[1-2]	[2-3] [2-3]
Intel Pentium	133MHz	2.0x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [2-3]
Intel Pentium	120MHz	2.0x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [2-3]
Intel Pentium	100MHz	1.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
Intel Pentium	90MHz	1.5x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [1-2]
Intel Pentium	75MHz	1.5x	50MHz	[2-3]		[2-3]	[2-3]	[1-2] [1-2]
AMD-K6-PR233	233MHz	3.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
AMD-K6-PR200	200MHz	3.0x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [1-2]
AMD-K6-PR166	166MHz	2.5x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [2-3]
AMD-K5-PR133	100MHz	1.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
AMD-K5-PR120	90MHz	1.5x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [1-2]
AMD-K5-PR100	100MHz	1.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
AMD-K5-PR90	90MHz	1.5x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [1-2]
AMD-K5-PR75	75MHz	1.5x	50MHz	[2-3]		[2-3]	[2-3]	[1-2] [1-2]
IBM/Cyrix6x86MX-PR233	200MHz	3.0x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [1-2]
IBM/Cyrix6x86MX-PR200	166MHz	2.5x	66MHz	[2-3]		[1-2]	[2-3]	[2-3] [2-3]
IBM/Cyrix6x86MX-PR166	150MHz	2.5x	60MHz	[2-3]		[2-3]	[1-2]	[2-3] [2-3]
*IBM/Cyrix -PR166+	133MHz	2.0x	66MHz	[2-3]		[1-2]	[2-3]	[1-2]	[2-3]

*NOTE: Only IBM or Cyrix Rev 2.7 or later is supported on this motherboard (see preceding page). Bootup screen will show 6x86-P166+with the Cyrix PR166+ installed on this motherboard.

INSTALLATION	(Jumpers)
III.

ASUS TXP4-X User’s Manual 17