Asus TX97-X 7.CPU to BUS Frequency Ratio (BF0, BF1), 6.CPU External (BUS) Frequency Selection (FS0, FS1, FS2)

INSTALLATION .III (Jumpers)

III.INSTALLATION

6.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'sInternal frequency (the advertised CPU speed).

7.CPU to BUS Frequency Ratio (BF0, BF1)

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.

		FS2 FS1 FS0			FS2 FS1		FS0			FS2 FS1		FS0			FS2 FS1 FS0
			1						1			1						1
			2						2				2					2
			3						3				3					3
		50MHz			55MHz					60MHz					66MHz
	CPU External Clock (BUS) Frequency Selection
				BF1 BF0				BF1 BF0		1	BF1	BF0				BF1 BF0
						1								1	1
						2				2				2			2
Intel P54C						3				3				3			3
				1.5 x				2.0 x			3.0 x					2.5 x
Intel P55C				3.5 x				2.0 x			3.0 x					2.5 x
Cyrix M1				3.0 x				2.0 x			3.0 x					2.0 x

CPU : BUS Frequency Ratio

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

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

*NOTE: Only Cyrix Revision 2.7 or later is supported on this motherboard. See next page for revision identification. Bootup screen will show 6x86-P166+with the Cyrix 166+ installed on this motherboard.

18 ASUS TX97-X User’s Manual