Asus P/I-P55T2P4 8.CPU to BUS Frequency Ratio (JP11, JP12), 7.CPU External (BUS) Frequency Selection (JP8, JP9, JP10)

INSTALLATION .III (Jumpers)

III.INSTALLATION

7.CPU External (BUS) Frequency Selection (JP8, JP9, JP10)

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).

8.CPU to BUS Frequency Ratio (JP11, JP12)

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.

	JP8 JP9 JP10	JP8 JP9 JP10		JP9 JP10	JP8	JP10	JP8 JP9	JP10	JP8 JP9
	1		1		1		1		1
	2		2		2		2		2
	3		3		3		3		3
	50MHz	55MHz		60MHz		66MHz		75MHz
	CPU External Clock (BUS) Frequency Selection
		JP12	JP11	JP12	JP11	JP12	JP11	JP12	JP11
			1		1		1		1
			2		2		2		2
			3		3		3		3
Complete Names:	P54C/K5	1.5x(3/2)		2.0x(2/1)		2.5x(5/2)		3.0x(3/1)
Intel Pentium P54C, P55C-MMX	P55C/K6/MX	3.5X(7/2)		2.0x(2/1)		2.5x(5/2)		3.0x(3/1)
AMD K5, K6	IBM/Cyrix 6x86	3.0x(3/1)		2.0x(2/1)		1.0x(1/1)		4.0x(4/1)
IBM/Cyrix 6x86, 6x86MX	CPU : BUS Frequency Ratio

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

					(BUS Freq.)			(Freq. Ratio)
CPU Model	Freq.	Ratio	B. Freq.	JP10		JP9	JP8	JP12	JP11
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	[1-2]		[2-3]	[2-3]	[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	[1-2]		[2-3]	[2-3]	[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	[1-2]		[2-3]	[2-3]	[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-PR133/100	100MHz	1.5x	66MHz	[2-3]		[1-2]	[2-3]	[1-2] [1-2]
AMD-K5-PR120/90	90MHz	1.5x	60MHz	[1-2]		[2-3]	[2-3]	[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	[1-2]		[2-3]	[2-3]	[2-3]	[2-3]
*IBM/Cyrix6x86-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 next page). Bootup screen will show 6x86-P166+with the Cyrix PR166+ installed on this motherboard.

10 ASUS P/I-P55T2P4 User's Manual