User Guide

Hardware Installation
2-5
2.2.1 Setting the CPU Voltage
JP11
1-2
3-4
5-6
7-8
9-10
11-12
CPU Core Voltage (Vcore)
3.45V (Intel P54C)
3.52V (Cyrix or AMD K5)
2.9V (AMD K6-166/200 or Cyrix M2)
2.8V (MMX P55C)
3.2V (AMD K6-233)
2.5V/2.2V/2.0V (Reserved)
JP11 is used to select CPU
core voltage (Vcore),
normally it is set to default
3.45V for INTEL Pentium
P54C. It must be changed if
you have CPU with different
core voltage, such as
INTEL PP/MT MMX (P55C),
AMD K5/K6 and Cyrix 6x86,
refer to the CPU
specification for more
details.
JP11
1
3
5
7
9
11
2
4
6
8
10
12
3.45V
P54C
JP11
1
3
5
7
9
11
2
4
6
8
10
12
3.52V
6x86 or
K5
JP11
1
3
5
7
9
11
2
4
6
8
10
12
2.9V
K6-166
K6-200
M2
JP11
1
3
5
7
9
11
2
4
6
8
10
12
2.8V
MMX
P55C
JP11
1
3
5
7
9
11
2
4
6
8
10
12
3.2V
K6-233
Warning: Please make sure that you have installed CPU fan
properly if Intel PP/MT-233 or AMD K6-200/233 is being
selected to use. It may cause your system unstable if you can
not meet the heat dissipation requirement from above CPU type.
It is recommended to adopt larger fan on these CPU for better
air flow in the system.
Tip: Normally, for single voltage CPU, Vcpuio (CPU I/O Voltage)
is equal to Vcore, but for CPU that needs dual voltage such as
PP/MT (P55C) or Cyrix 6x86L, Vcpuio is different from Vcore
and must be set to Vio (PBSRAM and Chipset Voltage). The
single or dual voltage CPU is automatically detected by
hardware circuit.
Tip: JP11 pin 11-12 is reserved for future CPU, the most
possible value is 2.0V. It is not yet decided when this manual is
printed. Use voltage meter or check your distributor before you
use pin 11-12.