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CPU External (BUS) Frequency Selection (FSO, FSl, FS2)
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's
CPU to BUS Frequency Ratio (BFO, BFl)
These jumpers set the frequency ratio between the
External
and the
be set together with the above iumpers
Complete Names:
Intel Pentium P54C, P55C-MMX
AMD K5, K6
Set the jumpers by the Internal speed of the Intel, AMD, IBM, or Cyrix CPU as follows:
CPU
M o d e l
Intel (Reserved)
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
Intel Pentium
AMD-K6-PR233 233MHz 3.5x
AMD-K6-PR200 200MHz 3.0x
AMD-K6-PR166 166MHz 2.5x
AMD-KS-PR 133 1 OOMHz
AMD-KS-PRl20 90MHz
AMD-KS-PR 100 1 OOMHz
AMD-KS-PR90 90MHz
*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 166+ installed on this motherboard.
18
frequency (called the BUS Clock) within the CPU. These must
Freq.
Ratio
BUS Freq.
233MHz
3.5x
2.5x
1 SOMHz
1.5x
1 OOMHz
1.5x
1.5x
Internal
frequency (the advertised CPU speed).
Internal
CPU External (BUS) Frequency Selection.
1
1
2
2
3
3
CPU
BUS Frequency Ratio
frequency of the CPU
1
1
2
2
3
3
(Freq. Ratio)
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