Jaton PowerPro VX, User Manual

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Chapter 3
20
CPU Power Plane:
In the previous chapter we explained that the 586 CPUs can be divided into two
types: single voltage and dual voltage. The system BIOS will normally auto-detect
the type of your CPU, and set the voltage accordingly, so you don
’
t need to make
any changes unless you want to configure the CPU with custom setting. You may skip
this section if your CPU is listed in the Soft MENU.
Single Voltage: Single voltage CPU
Dual Voltage: Dual voltage CPU
Set up the voltage via CPU Marking

When the CPU is single voltage, the following options will be displayed to set
up the voltage:
Plane voltage:
3.52v For Intel VRE standard CPUs and AMK-K5 or Cyrix 8x86 CPUs
3.38v For Intel STD and VR standards CPUs

When the CPU is dual voltage , two options will be displayed to set up Vcore
and Vio plane voltage
Core Plane Voltage:
2.90v For AMD-K6/200 CPU.
2.80v For Intel Pentium MMX, Cyrix 6x86L and Cyrix
6x86MX CPU.
2.70v For future CPUs.
2.50v For future CPUs. (If hardware supports.)
3.20v For AMD-K6/233 and future CPUs. (If hardware
supports.)
I/O Plane Voltage:
3.52v Reserved
3.38v Some CPUs from AMD need this I/O Plane Voltage.
3.30v For most of the dual voltage CPUs (default) currently available.
The CPU voltage must be set according to the manufacture’s specification. The
voltage information can be derived from the CPU Marking by the manufacturer. Since
the voltage of future CPU will decrease as technology improves, we have reserved some
options according to what we can forecast from present documentation. We cannot give
you detailed information about the voltage required by each kind of CPU in this chapter.
For the correct values, refer to appendices B, C and D.

Set up the CPU voltage:
If you think that to set up CPU by referring Appendices is too complicated, you
may try to use the CPU Marking: within the options under
“
CPU Marking Is,
”
set up the CPU by looking up the CPU Marking on the CPU.
Notes:
1. If your CPU is a dual voltage one and that the voltage set up is 3.52V, our
main board features a hardware protection circuit that will lower the voltage
between 2.8V and 2.9V, which is within the CPU operating voltage limits.
2. The voltage value given is the central value. For example, the voltage range
of 3.52V is 3.45V to 3.6V. The central voltage value between 3.45V and 3.6V
is 3.52V.
Attention: After setting up the parameters and you leave the BIOS SETUP, and you
have verified that the system can be booted, do not press the Reset button or
turn off the power supply. Doing so, the BIOS will not read the parameters