Computer Hardware User Manual

22 Chapter 2: Hardware information
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.
2) CPU and DRAM Frequency Selection (DIP_SW Switches 1–4)
This option tells the clock generator what frequency to send to the CPU,
DRAM, and the PCI bus, permiting selection of the CPU’s External frequency
(or, BUS Clock) and the DRAM memory speed.
A7S333
®
A7S333 CPU
External Frequency Selection
DSW
CPU
DRAM
100MHz
100MHz
ON
1234
133MHz
133MHz
ON
1234
133MHz
100MHz
ON
1234
100MHz
133MHz
ON
1234
133MHz
166MHz
ON
1234
Frequency Table
DSW
CPU DRAM 1 2 3 4
133 166 [OFF] [OFF] [ON] [ON]
100 133 [ON] [ON] [ON] [OFF]
133 100 [OFF] [ON] [ON] [OFF]
133 133 [OFF] [ON] [OFF] [OFF]
100 100 [OFF] [OFF] [OFF] [OFF]