Asus P/I-XP55TVP4 5.CPU to BUS Frequency Ratio (BF0, BF1), 4.CPU External (BUS) Frequency Selection (FS0, FS1, FS2)

INSTALLATION .III (Jumpers)

III.INSTALLATION

4.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).

5.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.

	1 2 3	1 2 3	1 2 3	1 2 3
	BF0
	BF1
	1.5 (3/2)	2.0 (2/1)	3.0 (3/1)	2.5 (5/2)
	FS2 FS1 FS0	FS2 FS1 FS0	FS2 FS1 FS0	FS2 FS1 FS0
	1	1	1	1
	2	2	2	2
	3	3	3	3
BUS Frequency Ratio	50MHZ	60MHZ	55MHZ	66.6MHZ

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	BF0	BF1
Intel Pentium	200MHz	3.0x	66MHz	[1-2]		[2-3]	[2-3]	[1-2] [2-3]
Intel Pentium	166MHz	2.5x	66MHz	[1-2]		[2-3]	[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	[1-2]		[2-3]	[2-3]	[2-3] [1-2]
Intel Pentium	120MHz	2.0x	60MHz	[2-3]		[2-3]	[1-2]	[2-3] [1-2]
Intel Pentium	100MHz	1.5x	66MHz	[1-2]		[2-3]	[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 PR133	100MHz	1.5x	66MHz	[1-2]		[2-3]	[2-3]	[1-2] [1-2]
AMD PR120	90MHz	1.5x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [1-2]
AMD PR100	100MHz	1.5x	66MHz	[1-2]		[2-3]	[2-3]	[1-2] [1-2]
AMD P90	90MHz	1.5x	60MHz	[2-3]		[2-3]	[1-2]	[1-2] [1-2]
AMD P75	75MHz	1.5x	50MHz	[2-3]		[2-3]	[2-3]	[1-2] [1-2]
*Cyrix 166+	133MHz	2.0x	66MHz	[1-2]		[2-3]	[2-3]	[2-3]	[1-2]

*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+-S CPU at 133MHz with the Cyrix 166+ installed on this motherboard.

10 ASUS P/I-XP55TVP4 User’s Manual