MSI MS5169 User Guide - Page 7

CPU Core Speed Derivation Procedure

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CHAPTER 2 HARDWARE INSTALLATION 2.1-2 CPU Core Speed Derivation Procedure 1. The DIP switch S1 (4 & 5) is used to adjust the CPU clock frequency. S1 CPU 4 5 Clock OFF ON 66.6MHz OFF OFF 75MHz ON ON 83.3MHz ON OFF 100MHz 2. The DIP switch S1 (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. For example: If CPU Clock = 66MHz Core/Bus ratio = 3/2 then CPU core speed = Host Clock x Core/ Bus ratio = 66MHz x 3/2 = 100MHz S1 CPU 1 2 3 Core/Bus Ratio OFF ON OFF 3 ON ON OFF 2.5 ON OFF OFF 2 OFF OFF OFF 1.5/3.5 3. The AGP/PCI Bus Clock: CPU AGP PCI 100 66 33 83.3 66 33 75 60 30 66 66 33 2-2

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CHAPTER 2
HARDWARE INSTALLATION
2-2
2.1-2
CPU Core Speed Derivation Procedure
1. The DIP switch S1 (4 & 5) is used to adjust the CPU clock frequency.
2.
The DIP switch S1 (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.
For example:
If
CPU Clock
=
66MHz
Core/Bus ratio
=
3/2
then
CPU core speed
=
Host Clock x
Core/
Bus ratio
=
66MHz x 3/2
=
100MHz
4
5
Clock
OFF
ON
66.6MHz
OFF
OFF
75MHz
ON
ON
83.3MHz
ON
OFF
100MHz
S1
CPU
3.
The AGP/PCI Bus Clock:
S1
CPU
1
2
3
Core/Bus Ratio
OFF
ON
OFF
3
ON
ON
OFF
2.5
ON
OFF
OFF
2
OFF
OFF
OFF
1.5/3.5
CPU
AGP
PCI
100
66
33
83.3
66
33
75
60
30
66
66
33