User Guide

Hardware Installation
2-11
Cyrix 6x86 CPU Core
Frequency
Ratio External
Bus Clock
JP1 & JP2 JP3 & JP4
P120+ 100MHz = 2x 50MHz 2-3 & 1-2 2-3 & 2-3
P150+ 120MHz = 2x 60MHz 2-3 & 1-2 1-2 & 2-3
P166+ 133MHz = 2x 66MHz 2-3 & 1-2 2-3 & 1-2
Cyrix M2 CPU Core
Frequency
Ratio External Bus
Clock
JP1 & JP2 JP3 & JP4
MX-PR166 150MHz = 2.5x 60MHz 2-3 & 2-3 1-2 & 2-3
MX-PR200 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
MX-PR233 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
MX-PR266 233MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2
AMD K5 CPU Core
Frequency
Ratio External
Bus Clock
JP1 & JP2 JP3 & JP4
PR90 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3
PR100 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2
PR120 90MHz = 1.5x 60MHz 1-2 & 1-2 1-2 & 2-3
PR133 100MHz = 1.5x 66MHz 1-2 & 1-2 2-3 & 1-2
PR166 116MHz = 1.75x 66MHz 2-3 & 2-3 2-3 & 1-2
AMD K6 CPU Core
Frequency
Ratio External
Bus Clock
JP1 & JP2 JP3 & JP4
PR2-166 166MHz = 2.5x 66MHz 2-3 & 2-3 2-3 & 1-2
PR2-200 200MHz = 3x 66MHz 1-2 & 2-3 2-3 & 1-2
PR2-233 233MHz = 3.5x 66MHz 1-2 & 1-2 2-3 & 1-2
Notes: The Cyrix 6x86 and AMD K5 CPUs use
P-rating for the reference of CPU benchmark.
Unlike the Intel P54C, their internal core frequency
is not exactly equal to P-rating marked on the
CPU. For example, the AMD PR133 frequency is
100MHz, but its performance is almost equal to
Intel P54C 133MHz.
The Intel VX chipset does not support CPU with
55MHz and 75MHz external bus clock; thus, this
motherboard cannot support Cyrix P133+ and C6-
150.