Abit SM5, User Manual

Page: 37 / 96

Introduction of BIOS 3-9
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When the CPU is dual voltage , two options will be displayed to set up
Vcore and Vio plane voltage
/
Core Plane Voltage:
ä
2.90v
：
For AMD K6-200 CPU.
ä
2.80v
：
For Intel Pentium MMX and Cyrix 6x86L CPU.
ä
2.70v
：
For future CPUs.
ä
2.50v
：
For future CPUs. (If hardware supports.)
ä
3.20v
：
For AMD K6-233 and future CPUs. (If hardware
supports.)
/
I/O Plane Voltage:
ä
3.52v
：
Reserved
ä
3.38v
：
Some CPUs from AMD need this I/O Plane Voltage.
ä
3.30v
：
For most of the dual voltage CPUs (default) currently available.
The CPU voltage must be set according to voltage indications via CPU Marking
given by the manufacturer. Since the CPU voltage 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.
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Set up the voltage via CPU Marking:
If you consider using the Appendices to set up as too complicated, you can
use the CPU Marking: within the options under
“
CPU Marking Is,
”
set up
via 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
mainboard 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.