User Manual
16 ASUS P5A-VM User’s Manual
III. INSTALLATION
Jumpers
III. INST ALLATION
6 CPU External (BUS) Frequency Selection (FS0, FS1, FS2, FS3)
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).
7. 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 together with the jumpers for CPU External (BUS) Frequency Selection.
Match the Mult. (Multiple) column of the table on
the opposite page to these CPU types:
P5A-VM
CPU External Clock (BUS) Frequency Selection
CPU : BUS Frequency Multiple
3.0x(3/1)
3.0x(3/1)
3.0x(3/1)
3.0x(3/1)
—
3.0x(3/1)
2.5x(5/2)
2.5x(5/2)
2.5x(5/2)
2.5x(5/2)
1.0x(1/1)
2.5x(5/2)
6.0x(6/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
2.0x(2/1)
3.22x(10/3)
3.5x(7/2)
3.5x(7/2)
1.5x(3/2)
3.5x(7/2)
3.0x(3/1)
3.5x(7/2)
CPU A
CPU B
CPU C
CPU D
CPU E
CPU F
4.0x(4/1)
4.0x(4/1)
—
—
—
4.0x(4/1)
4.5x(9/2)
4.5x(9/2)
—
—
—
4.5x(9/2)
105MHz
70MHz
35MHz
110MHz
73MHz
36.6MHz
115MHz
76.6MHz
38.3MHz
120MHz
80MHz
40MHz
BF2
BF1
BF0
CPU
AGP
PCI
→
→
→
→
→
→
→
→
→
60MHz
60MHz
30MHz
66.8MHz
66.8MHz
33.4MHz
75MHz
75MHz
37.5MHz
83.3MHz
66.6MHz
33.3MHz
95MHz
63.3MHz
31.6MHz
100MHz
66.6MHz
33.4MHz
CPU
AGP
PCI
→
→
→
5.0x(5/1)
5.0x(5/1)
—
—
—
2.33(7/3)
123
123123123123123123
123
R
01
FS3
FS2
FS1
FS0
321
FS3
FS2
FS1
FS0
321
321 321 321
5.5x(11/2)
5.5x(11/2)
—
—
—
2.66x(8/3)
75MHz
60MHz
30MHz
321
321
321321321321
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
included with your CPU when possible.
NOTE: For updated processor settings, visit the ASUS web site (see ASUS CON-
TACT INFORMATION for URLs).