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MS-5153
CPU Speed Setting: SW1
To adjust the speed and voltage of the CPU, you must know the specifications
of your CPU (always ask the vendor for CPU specifications). Then
refer to table 5 (Intel Prossors), Table 6 (Cyrix Processors), and
Table 7 (AMD Processors) for proper setting.
1. The mainboard suuports different clock frequencies adjusted
by SW1 pin 4,5, and 6. See the following chart to set the different
Host Clock Frequencies.
|
SW1
|
CPU
|
|
4
|
5
|
6
|
Clock
|
|
ON
|
ON
|
OFF
|
55MHz
|
|
ON
|
OFF
|
OFF
|
60MHz
|
|
OFF
|
OFF
|
OFF
|
66MHz
|
|
OFF
|
ON
|
OFF
|
75MHz
|
|
OFF
|
OFF
|
ON
|
68.5MHz
|
Special CPU Clock:
|
SW1
|
CPU
|
|
4
|
5
|
6
|
Clock
|
|
OFF
|
OFF
|
OFF
|
50MHz
|
|
OFF
|
OFF
|
ON
|
69.5MHz
|
|
OFF
|
ON
|
ON
|
78MHz
|
|
ON
|
ON
|
OFF
|
83.3MHz
|
|
ON
|
OFF
|
ON
|
85.5MHz
|
|
ON
|
OFF
|
OFF
|
100MHz
|
NOTE: If you are going to use the special CPU clock, then you
must short JRMS3
The JRMS3 jumper is located next to the SW1 DIP switch.
2. The DIP Switch SW1 (1,2 and 3) is used to set the Core/Bus (Fraction)
ratio of the CPU. The actual core speed of the CPU is the Host Clock
Frequency multiplied by the Core/Bus ratio.
|
SW1
|
CPU
|
|
1
|
2
|
3
|
Core/Bus Ratio
|
|
OFF
|
OFF
|
OFF
|
1.5/3.5
|
|
ON
|
OFF
|
OFF
|
2
|
|
ON
|
ON
|
OFF
|
2.5/1.75
|
|
OFF
|
ON
|
OFF
|
3
|
3. CPU Voltage: The mainboard voltage regulators can automatically
detect and switch between Single and Dual voltage. It can detect
single voltage ranging from 3.38 volts to 3.52 volts. And dual voltage
ranging from 2.0 volts to 3.2 volts.
4.Intel Processors: Intel Processors
Intel Pentium Processor with MMX Technology
|
CPU Type
|
CPU Speed
|
|
SW1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
|
90MHz
|
OFF
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
|
100MHz
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
|
120MHz
|
ON
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
|
133MHz
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
|
150MHz
|
ON
|
ON
|
OFF
|
ON
|
OFF
|
OFF
|
|
166MHz
|
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
|
200MHz
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
Intel Pentium Processors with MMX technology
|
166MHz
|
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
|
200MHz
|
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
|
233MHz
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
BACK TO TOP
5. Cyrix Processors: Cyrix 6x86 processor
uses PR to rate the speed of their processors based on Intel Pentium
processor core speed. For example PR150 (120MHz)has 150Mhz core speed
of Intel Pentium processor but has 120MHz core speed in Cyrix. Cyrix
6x86 processor should always use a more powerful fan (ask vendor for
proper cooling fan).
Cyrix 6x86 Processors:
|
CPU Type
|
CPU Speed
|
|
SW1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
|
PR133 (110MHz)
|
ON
|
OFF
|
OFF
|
ON
|
ON
|
OFF
|
|
PR150 (120MHz)
|
ON
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
|
PR166 (133MHz)
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
Cyrix 6x86L Processors:
|
166MHz
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
Cyrix 6x86MX Processors
| PR166 (60x2.5) |
ON
|
ON
|
OFF
|
ON
|
OFF
|
OFF
|
| PR166 (66x2) |
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
PR200
(66x2.5) |
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
PR200
(75x2) |
ON
|
OFF
|
OFF
|
OFF
|
ON
|
OFF
|
PR233
(66x3) |
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
PR233
(75x2.5)
|
ON
|
ON
|
OFF
|
OFF
|
ON
|
OFF
|
| PR266 (66x3.5) |
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| PR266 (75x3) |
OFF
|
ON
|
OFF
|
OFF
|
ON
|
OFF
|
BACK TO TOP
6. AMD Processor: AMD K5 processor uses
PR to rate the speed of their processors based on Intel Pentium processor
core speed. For example PR133 (100MHz) has 133 MHz core speed of Intel
Pentium processor but has 100MHz core speed in AMD K5 processor.
AMD K5 Processors:
|
CPU Type
|
CPU Speed
|
|
SW1
|
|
1
|
2
|
3
|
4
|
5
|
6
|
| PR90 (90MHz) |
OFF
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
| PR100 (100MHz) |
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| PR120 (90MHz) |
ON
|
OFF
|
OFF
|
ON
|
OFF
|
OFF
|
| PR133 (100MHz) |
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
| PR150 (105MHz) |
ON
|
ON
|
OFF
|
ON
|
OFF
|
OFF
|
| PR166 (116.7MHz) |
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
AMD K6 Processors:
166MHz
|
ON
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
| 200MHz |
OFF
|
ON
|
OFF
|
OFF
|
OFF
|
OFF
|
| 233MHz |
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
OFF
|
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