Cmos rtc & isa cfg cmos sram – GIGABYTE Pentium II / III Processors 6ZMM User Manual
Page 21
Hardware Installation
3-7
the DIP SWITCH (SW1) selection to set up the CPU speed for 233 - 650MHz
processor. The CPU speed must match with the frequency RATIO. It will
cause system hanging up if the frequency RATIO is higher than CPU's.
DIP SWITCH (SW)
1
2
3
4
FREQ.
RATIO
EXT.CLK.
MHz
INT.CLK.
MHz
CPU Type
OFF
OFF
ON
ON
3.5
66
233
Pentium
II 233 MHz
(Celeron 233MHz)
ON
ON
OFF
ON
4
66
266
Pentium
II 266 MHz
(Celeron 266MHz)
OFF
ON
OFF
ON
4.5
66
300
Pentium
II 300 MHz
(Celeron 300MHz)
ON
OFF
OFF
ON
5
66
333
Pentium
II 333 MHz
(Celeron 333MHz)
OFF
OFF
OFF
ON
5.5
66
366
Pentium
II 366 MHz
(Celeron 366MHz)
ON
ON
ON
OFF
6
66
400
Pentium
II 400 MHz
(Celeron 400MHz)
OFF
ON
ON
OFF
6.5
66
433
Pentium
II 433 MHz
(Celeron 433MHz)
OFF
OFF
ON
ON
3.5
100
350
Pentium
II 350 MHz
ON
ON
OFF
ON
4
100
400
Pentium
II 400 MHz
OFF
ON
OFF
ON
4.5
100
450
Pentium
III450 MHz
ON
OFF
OFF
ON
5
100
500
Pentium
III500 MHz
OFF
OFF
OFF
ON
5.5
100
550
Pentium
III 550 MHz
ON
ON
ON
OFF
6
100
600
Pentium
III 600 MHz
OFF
ON
ON
OFF
6.5
100
650
Pentium
III 650 MHz
M
The CPU is a sensitive electric component and it can be easily
damaged by static electricity, so users must keep it away from
metal surface when the CPU is installed onto mainboard.
M
We don’ t recommend you to setup your system speed to 75, 83,
112, or 133MHz because these frequencies are not the standard
specifications for CPU, Chipset and most of the peripherals.
Whether your system can run under 75, 83, 112 or 133MHz properly
will depend on your hardware configurations: CPU, SDRAM, Cards,
etc.
3.6. CMOS RTC & ISA CFG CMOS SRAM
The mainboard contains RTC & CMOS SRAM on board. They have a power