User Guide
ASUS A7A266 User’s Manual 21
3. HARDWARE SETUP
3. H/W SETUP
Motherboard Settings
4) CPU External Frequency Setting (DSW Switches 1–4)
This option tells the clock generator which frequency to send to the CPU,
SDRAM, and chipset. This allows the selection of the CPU’s External frequency.
(The CPU External Frequency multiplied by the Frequency Multiple equals the
CPU’s Internal frequency (the advertised CPU speed).
IMPORTANT:
1. To use this feature, JEN must be set to Jumper Mode, [1-2].
(See 1, JumperFree™ Mode (JEN) in 3, HARDWARE SETUP.)
2. In JumperFree mode, all dip switches (DSW-1–DSW-4) must be set to OFF.
3. When JumperFree mode is enabled, use BIOS setup in place of these switches.
(Set Operating Frequency Setting to User Define under 4.4 Advanced Menu
in BIOS Setup so you can set the CPU Frequency.)
0 10 1
A7A266
A7A266 CPU External
Frequency Selection
DSW
ON
1234
ON
1234
ON
1234
ON
1234
133MHz
133MHz
100MHz
100MHz
100MHz
133MHz
120MHz
120MHz
CPU
SDRAM
→
→
ON
1234
ON
1234
ON
1234
CPU
SDRAM
→
→
126MHz
126MHz
101MHz
101MHz
90MHz
90MHz
5
6
7
8 9
10
5
6
7
8 9
10
5
6
7
8 9
10
5
6
7
8 9
10
5
6
7
8 9
10
5
6
7
8 9
10
5
6
7
8 9
10
WARNING! Frequencies other than recommended CPU bus frequencies are not
guaranteed to be stable. Overclocking your processor is not advised. It may result
in a slower speed and premature wearing of the processor.