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Page 32

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Chapter 2: Hardware information

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).

®

A7V266-M

A7V266-M CPU External
Frequency Selection

SYSCLK

(JumperFree Mode)

140MHz

70MHz
35MHz

ON

12

34

ON

12

34

CPU
AGP
PCI

CPU
AGP
PCI

100MHz

66.67MHz
33.33MHz

133.33MHz

66.67MHz
33.33MHz

ON

12

34

ON

12

34

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].

CPU

AGP PCI

DSW1

DSW2

DSW3

DSW4

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]