III. INSTALLATION

6CPU 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.

ALLATION INST .III

Jumpers

P5A-VM

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™

1 2 3

1 2 3

1 2 3

1 2 3

1 2 3

1 2 3

FS3

 

 

 

 

 

FS2

 

 

 

 

 

FS1

 

 

 

 

 

FS0

 

 

 

 

 

CPU → 60MHz

66.8MHz

75MHz

75MHz

83.3MHz

95MHz

AGP → 60MHz

66.8MHz

75MHz

60MHz

66.6MHz

63.3MHz

PCI → 30MHz

33.4MHz

37.5MHz

30MHz

33.3MHz

31.6MHz

FS3

1 2 3

 

 

1 2 3

 

1 2 3

 

 

1 2 3

 

 

1 2 3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FS0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU →

100MHz

 

105MHz

 

110MHz

 

 

115MHz

 

120MHz

 

 

AGP →

66.6MHz

 

70MHz

 

73MHz

 

 

76.6MHz

 

80MHz

 

 

PCI →

33.4MHz

 

35MHz

 

36.6MHz

 

38.3MHz

 

40MHz

 

 

CPU External Clock (BUS) Frequency Selection

 

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

1

2

3

BF2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BF1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BF0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU A →3.5x(7/2)

6.0x(6/1)

2.5x(5/2)

3.0x(3/1) 4.0x(4/1) 4.5x(9/2) 5.0x(5/1) 5.5x(11/2)

CPU B →3.5x(7/2)

2.0x(2/1)

2.5x(5/2)

3.0x(3/1) 4.0x(4/1) 4.5x(9/2) 5.0x(5/1) 5.5x(11/2)

CPU C →1.5x(3/2) 2.0x(2/1)

2.5x(5/2)

3.0x(3/1)

 

—

 

 

—

 

 

—

 

 

—

 

CPU D →3.5x(7/2) 2.0x(2/1)

2.5x(5/2)

3.0x(3/1)

 

—

 

 

—

 

 

—

 

 

—

 

CPU E →3.0x(3/1) 2.0x(2/1)

1.0x(1/1)

 

—

 

 

—

 

 

—

 

 

—

 

 

—

 

CPU F →3.5x(7/2) 3.22x(10/3) 2.5x(5/2)

3.0x(3/1) 4.0x(4/1) 4.5x(9/2) 2.33(7/3) 2.66x(8/3)

CPU : BUS Frequency Multiple

WARNING! Frequencies above 100MHz exceed the specifications for the onboard 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 CONTACT INFORMATION for URLs).

16

ASUS P5A-VM User’s Manual