Asus C-P55T2D Jumper Settings, III. INSTALLATION, CPU, BUS, Ext, JP3, JP2, JP15, JP16, Freq, [ON], [ON], [ON], [ON], [ON], [ON], [ON], Ratio, [OFF], [OFF], 66MHz, [1-2]

III. INSTALLATION

Jumper Settings

CPU to BUS Frequency Ratio (JP15, 16)

These jumpers set the frequency ratio between the Internal frequency of the CPU and the External frequency (called the BUS Clock) within the CPU.

2	1
			3/2	2	5/2	3
		JP15
		JP16
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 Pentium or compatible CPUs as follows:

		(CPU Card			(CPU Ext. Freq
CPU	BUS	BUS Ratio)		Ext.	on Baseboard)
Internal	Ratio	JP15	JP16	Freq.	JP3	JP2
233MHz	3.5x	[OFF]	[OFF]	66MHz	[1-2]	[2-3]
200MHz	3.0x	[ON]	[OFF]	66MHz	[1-2]	[2-3]
166MHz	2.5x	[ON]	[ON]	66MHz	[1-2]	[2-3]
150MHz	2.5x	[ON]	[ON]	60MHz	[2-3]	[1-2]
133MHz	2.0x	[OFF]	[ON]	66MHz	[1-2]	[2-3]
120MHz	2.0x	[OFF]	[ON]	60MHz	[2-3]	[1-2]
100MHz	1.5x	[OFF]	[OFF]	66MHz	[1-2]	[2-3]
90MHz	1.5x	[OFF]	[OFF]	60MHz	[2-3]	[1-2]
75MHz	1.5x	[OFF]	[OFF]	50MHz	[1-2]	[1-2]

JP2 JP3	JP2 JP3	JP2 JP3
1	1	1
2	2	2
3	3	3
66MHz	60MHz	50MHz

CPU External Clock (BUS) Frequency Selection

WARNING: The CPU and/or motherboard will overheat if there is no airflow across the CPU and onboard heatsinks.

INSTALLATION	(Jumpers)
III.

ASUS C-P55T2D User’s Manual 3