Asus P/I-AP55TV External, Internal, Internal, External, BUS Clock, BUS Clock, CPU External (BUS) Frequency Selection, 7.CPU to BUS Frequency Ratio (JP18, JP19)

INSTALLATION .III (Jumpers)

III.INSTALLATION

6.CPU External (BUS) Frequency Selection (JP14, JP15, JP16)

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 (JP18, JP19)

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.

JP16	JP15	JP14	JP16	JP15	JP14	JP16	JP15	JP14	JP16	JP15	JP14
			1			1			1		1
			2			2			2		2
			3			3			3		3

50MHz		55MHz		60MHz		66MHz
CPU External Clock (BUS) Frequency Selection
JP19	JP18	JP19	JP18	JP19	JP18	JP19	JP18
1.5 x		2.0 x		2.5 x		3.0 x

CPU : BUS Frequency Ratio (1.5x, 2.0x, 2.5x, 3.0x)

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.	JP16		JP15	JP14	JP19 JP18
Intel Pentium	200MHz	3.0x	66MHz	[2-3]		[2-3]	[1-2]	[1-2] [2-3]
Intel Pentium	166MHz	2.5x	66MHz	[2-3]		[2-3]	[1-2]	[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]		[2-3]	[1-2]	[2-3] [1-2]
Intel Pentium	120MHz	2.0x	60MHz	[1-2]		[2-3]	[2-3]	[2-3] [1-2]
Intel Pentium	100MHz	1.5x	66MHz	[2-3]		[2-3]	[1-2]	[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	100MHz	1.5x	66MHz	[2-3]		[2-3]	[1-2]	[1-2]	[1-2]
AMD	90MHz	1.5x	60MHz	[1-2]		[2-3]	[2-3]	[1-2]	[1-2]
AMD	75MHz	1.5x	50MHz	[2-3]		[2-3]	[2-3]	[1-2]	[1-2]
*Cyrix 166+	133MHz	2.0x	66MHz	[2-3]		[2-3]	[1-2]	[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-AP55TV User’s Manual