User Guide

Hardware Installation
2-11
AMD K6 CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4 & JP5 & JP6
PR2-166 166MHz = 2.5x 66MHz ON ON OFF 2-3 & 1-2 & 1-2
PR2-200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2
PR2-233 233MHz = 3.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
PR2-266 266MHz= 4x 66MHz ON OFF ON 2-3 & 1-2 & 1-2
PR2-300 300MHz= 4.5x 66MHz ON ON ON 2-3 & 1-2 & 1-2
Cyrix 6x86
& 6x86L
CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4 & JP5 & JP6
P150+ 120MHz = 2x 60MHz ON OFF OFF 1-2 & 2-3 & 1-2
P166+ 133MHz = 2x 66MHz ON OFF OFF 2-3 & 1-2 & 1-2
P200+ 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3
Cyrix M2 CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4 & JP5 & JP6
MX-PR166 150MHz = 2.5x 60MHz ON ON OFF 1-2 & 2-3 & 1-2
MX-PR200 166MHz =
150MHz=
2.5x
2x
66MHz
75MHz
ON
ON
ON
OFF
OFF
OFF
2-3 & 1-2 & 1-2
1-2 & 2-3 & 2-3
MX-PR233 200MHz =
166MHz=
3x
2x
66MHz
83.3MHz
OFF
ON
ON
OFF
OFF
OFF
2-3 & 1-2 & 1-2
2-3 & 1-2 & 2-3
MX-PR266 233MHz = 3.5x 66MHz OFF OFF OFF 2-3 & 1-2 & 1-2
IDT C6 CPU Core
Frequency
Ratio External
Bus Clock
S1 S2 S3 JP4 & JP5 & JP6
C6-150 150MHz = 2x 75MHz ON OFF OFF 1-2 & 2-3 & 2-3
C6-180 180MHz = 3x 60MHz OFF ON OFF 1-2 & 2-3 & 1-2
C6-200 200MHz = 3x 66MHz OFF ON OFF 2-3 & 1-2 & 1-2
Note: Cyrix 6x86 and AMD K5 CPU use P-rating for the
reference of CPU benchmark compared with INTEL P54C,
their internal core frequency is not exactly equal to P-rating
marked on the CPU. For example, Cyrix P166+ is 133MHz but
performance is almost equal to P54C 166MHz and AMD
PR133 is 100MHz but performance is almost equal to INTEL
P54C 133MHz.
Note: INTEL TX chipset does not support CPU with 50/55MHz
external bus clock, so that P54C 75MHz, Cyrix P120+,P133+
and AMD PR75 are not supported by this mainboard.