Abit PD5NE User Manual page 20

2-12
P-Rating
The P-Rating was defined by some manufacturers other than Intel to rate
the performance of their CPU in comparison with Intel Pentium CPUs. For
instance, Cyrix 6x86 P166+ has a higher actual speed compared with Intel
Pentium P166, its internal clock needs only 133MHz versus 166MHz for
Intel' s product. The main reason is that Cyrix has improved the internal
architecture of the 6x86 CPU, which means that with the same internal
clock speed, the actual clock speed will be different.
Having read the related terminology above, please refer to the information in
appendices B, C or D for the type and specifications of your own CPU. We
suggest that you note down these specifications, which will help you when you
install the CPU.
Voltage and Frequency Setup
PD5N are using DIP switches to setup the CPU Frequency and voltage
please make sure which kind of CPU and its frequency and voltage before
you setup.
There are two DIP switches on the mainboard, one is using to setup CPU
frequency (including external clock and rating parameter) which is called
SW2, another one is SW1 which is using to setup the CPU voltage.
1. PD5N CPU frequency setting (SW2)
The following tables will present the adjustment for all serials of 586 CPU,
Please setup the correct adjustment regarding the CPU type and brand.
Clock Chip:PLL52C61-01H
External Clock
50MHZ
55MHZ
60MHZ
66MHZ
75MHZ
83MHZ
Intel CPU
DS6
ON
OFF
ON
OFF
ON
OFF
DS7
ON
OFF
OFF
ON
OFF
ON
Chapter 2
DS8
OFF
OFF
OFF
OFF
ON
ON