Asus SP98-N - Manual (Page 18)

18 ASUS SP98-N User’s Manual
3. HARDWARE SETUP
Motherboard Settings
3. IH/W 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
®
CPU External Clock (BUS) Frequency Selection
FS3
PCI Frequency Selection
Synchronous PCI Asynchronous PCI
Host
Sync PCI
Async PCI
FS1
FS0
FS2
1 2 3
50MHz
25MHz
32MHz
1 2 3
55MHz
27.5MHz
32MHz
1 2 3
60MHz
30MHz
32MHz
1 2 3
66.8MHz
33.4MHz
32MHz
1 2 3
75.9MHz
37.5MHz
32MHz
1 2 3
83.3MHz
41.7MHz
32MHz
FS3
1 2 3
FS3
1 2 3
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
CPU A
CPU B
CPU C
CPU D
CPU E 4.0x(4/1)
—
—
—
1.5x(3/2)
3
2
1
BF1 BF2 BF0
3
2
1
BF1 BF2 BF0
3.0x(3/1)
3.0x(3/1)
3.0x(3/1)
—
—
3
2
1
BF1 BF2 BF0
2.5x(5/2)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.0x(2/1)
3
2
1
BF1 BF2 BF0
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1) 4.5x(9/2)
—
—
—
1.5x(3/2)
BF1 BF2 BF0
2
3
1
BF1 BF2 BF0
3.5x(7/2)
1.5x(3/2)
3.5x(3/1)
3.0x(3/1)
—
CPU : BUS Frquency Multiple
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.