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3. HARDWARE SETUP
3. CPU to BUS Frequency Ratio (BF0, BF1, BF2)
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.
4. CPU External Clock (BUS) (FS0, FS1, FS2) and PCI Frequency Selection (FS3)
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
multiplied by the BUS Ratio equals the CPU's Internal frequency (the advertised
CPU speed).
SP98-N
Match the Mult. (Multiple) column
of the table on the opposite
page with these CPU types:
CPU A: AMD-K6-2, AMD-K6
CPU B:Intel Pentium P54C, AMD-K5
CPU C:Intel Pentium P55C, IBM/Cyrix
6x86MX, IBM/Cyrix M II
CPU D:IBM/Cyrix 6x86, IBM/Cyrix 6x86L
CPU E: IBM/Cyrix 6x86L
WARNING!
Do not overclock your processor. Overclocking can cause undue
stress on the CPU and motherboard. It may result in a slower speed or other
unpredictable outcomes. The table on the following page shows the approved
CPUs and their settings.
18
3
2
1
CPU A
3.5x(7/2)
2.0x(2/1)
CPU B
1.5x(3/2)
2.0x(2/1)
CPU C
3.5x(3/1)
2.0x(2/1)
CPU D
3.0x(3/1)
2.0x(2/1)
CPU E
—
2.0x(2/1)
CPU : BUS Frquency Multiple
FS0
FS1
FS2
FS3
Host
50MHz
Sync PCI
25MHz
Async PCI
32MHz
CPU External Clock (BUS) Frequency Selection
FS3
FS3
Synchronous PCI
Asynchronous PCI
PCI Frequency Selection
ASUS SP98-N User's Manual
3
3
3
2
2
2
1
1
1
2.5x(5/2)
3.0x(3/1)
4.0x(4/1)
2.5x(5/2)
3.0x(3/1)
2.5x(5/2)
3.0x(3/1)
1.0x(1/1)
—
2.0x(2/1)
—
1.5x(3/2)
55MHz
60MHz
66.8MHz
75.9MHz
27.5MHz
30MHz
33.4MHz
37.5MHz
32MHz
32MHz
32MHz
32MHz
3
2
1
4.5x(9/2)
—
—
—
—
—
—
1.5x(3/2)
83.3MHz
41.7MHz
32MHz
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