2) CPU External Frequency Selection (SYSCLK DSW Switches 1–4)

This option tells the clock generator which frequency to send to the CPU, DRAM, and the PCI bus. These switches permit selection of the CPU’s External frequency (or BUS Clock). The BUS Clock multiplied by the Frequency Multiple equals the CPU’s Internal frequency (the advertised CPU speed).

SYSCLK

 

 

 

ON 1

 

 

 

ON 1

 

 

 

 

 

 

 

 

 

 

2

 

 

 

2

 

 

 

 

 

 

 

3

 

 

 

3

 

 

 

 

 

 

 

4

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

CPU 100MHz 133.33MHz

AGP 66.67MHz 66.67MHz

PCI 33.33MHz 33.33MHz

ON 4 3 2 1

ON 4 3 2 1

 

 

 

 

 

 

 

 

 

 

 

CPU

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A7V266-M

 

 

 

140MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AGP

 

70MHz

(JumperFree Mode)

 

A7V266-M CPU External

 

 

PCI

 

 

 

 

 

 

 

 

 

35MHz

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Frequency Selection

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CPU

 

AGPPCIDSW1DSW2

 

DSW3DSW4

100

 

 

66.67

33.33

[ON]

[OFF]

 

 

[OFF]

[ON]

133

 

 

66.67

33.33

[OFF]

[OFF]

 

 

[OFF]

[OFF]

140

 

 

70

35

[ON]

[ON]

 

 

[ON]

[OFF]

 

 

 

 

 

 

 

 

JumperFree™

Mode

[OFF]

[OFF]

 

 

[OFF]

[OFF]

WARNING! Set the CPU frequency only to the recommended settings. Frequencies other than the recommended CPU bus frequencies are not guaranteed to be stable. Overclocking the processor is not recommended. It may result in a slower speed.

IMPORTANT! To use this feature, the JEN jumper must be set to JumperMode, [1-2].

20

Chapter 2: Hardware information