2-18
SIMATIC PC RI25/45, Technical Description
C79000-G7076-C808-01
1
2
3
4
5
6
1
2
3
4
5
6
ON
OFF
S2
ON
OFF
S1
Figure 2-6 Standard settings for switches S1 (1..6) and S2 (1..6) for
233 MHz Pentium CPU
Clock Setting
Jumper X34
open
closed
S2(5)
S2(6)
S1(5)
S1(6)
ISA bus
clock
PCI bus
clock
CPU bus
clock
CPU core clock
(CPU internal)
on
off
on
on
8.25MHz
33MHz
66MHz
133MHz
166MHz
off
on
on
on
7.50MHz
30MHz
60MHz
120MHz
150MHz
on
on
on
off
8.33MHz
25MHz
50MHz
100MHz
––––––
on
off
off
on
8.25MHz
33MHz
66MHz
100/233MHz 200MHz
off
on
off
on
7.50MHz
30MHz
60MHz
90MHz
180MHz
on
on
off
off
8.33MHz
25MHz
50MHz
75MHz
150MHz
Preferable settings are printed in bold letters
!
Caution
Operating a processor at a higher frequency than the maximum permissible
frequency may result in destruction of the processor, data loss, or data
corruption.
Motherboard