Asus P5A User Manual page 16

5. CPU External (BUS) Frequency Selection (FS3, FS2, FS1, FS0)
These jumpers tell the clock generator what frequency to send to the CPU, chipset,
and AGP. These allow the selection of the CPU's External frequency (or BUS
Clock). The BUS Clock times the BUS Ratio equals the CPU's Internal fre-
quency (the advertised CPU speed).
6. CPU to BUS Frequency Multiple (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 in conjunction with the jumpers for CPU External (BUS) Frequency Selection.
P5A
Match the Mult. (Multiple) column of
the table on the opposite page to these
CPU types:
CPU A: AMD-K6-III, AMD-K6-2/400&faster
CPU B: AMD-K6-2/380&slower, AMD-K6
CPU C: Intel Pentium P54C, AMD-K5
CPU D: Intel Pentium P55C, IBM/Cyrix
6x86MX, IBM/Cyrix M II
CPU E: IBM/Cyrix 6x86, IBM/Cyrix 6x86L
CPU F: IDT WinChip 2™
WARNING! Frequencies above 100MHz exceed the specifications for the on-
board chipset and are not guaranteed to be stable. The table on the following
page is for general reference purposes only. Always refer to the instructions in-
cluded with your CPU when possible.
16
III. INSTALLATION
1
2
3
CPU
60MHz
AGP 60MHz
PCI 30MHz
1
2
3
CPU
83.3MHz
AGP
66.6MHz
PCI 33.3MHz
1
2
3
CPU 110MHz
73MHz
AGP
PCI 36.6MHz
CPU External Clock (BUS) Frequency Selection
1
2
3
CPU A 3.5x(7/2)
3.5x(7/2)
CPU B
CPU C 1.5x(3/2)
CPU D 3.5x(7/2)
3.0x(3/1)
CPU E
CPU F 3.5x(7/2)
1
2
3
CPU A 4.0x(4/1)
CPU B 4.0x(4/1)
CPU C —
CPU D —
CPU E —
CPU F 4.0x(4/1)
CPU : BUS Frequency Multiple
ASUS P5A User's Manual
66.8MHz 75MHz 75MHz
66.8MHz 75MHz
60MHz
33.4MHz 37.5MHz
30MHz
95MHz 100MHz 105MHz
63.3MHz 66.6MHz 70MHz
31.6MHz 33.3MHz 35MHz
115MHz 120MHz
77.6MHz 80MHz
38.3MHz 40MHz
6.0x(6/1) 2.5x(5/2) 3.0x(3/1)
2.0x(2/1) 2.5x(5/2) 3.0x(3/1)
2.0x(2/1) 2.5x(5/2) 3.0x(3/1)
2.0x(2/1) 2.5x(5/2) 3.0x(3/1)
2.0x(2/1) 1.0x(1/1) —
3.33x(10/3) 2.5x(5/2) 3.0x(3/1)
4.5x(9/2) 5.0x(5/1) 5.5x(11/2)
4.5x(9/2) 5.0x(5/1) 5.5x(11/2)
— — —
— — —
— — —
4.5x(9/2) 2.33x(7/3) 2.66x(8/3)