User manual

Chapter 3
3-15
BIOS Setup
Unlock CPU Core [Disabled]
This item is used to unlock the CPU core. Please refer to the procedures below for
CPU core unlocked in BIOS setup.
Success
Enter “OC” and set “Unlock CPU Core” to [Enabled].
Save changes and exit the BIOS setup.
System restart.
You will see the “X4” (quad core) or “X2” (dual core for
Sempron series only) during POST.
Fail
Set “Adjust CPU-NB Ratio” and
“HT Link Speed” to [x8].
AMD Phenom(tm) II X4 Processor
Clear CMOS data.
The CPU does not support CPU core
unlocking, please leave the default
settings for system.
AMD Sempron(tm) II X2 Processor
Important
 This CPU core unlocked behavior depends on the CPU ability/ characteristic, and it
is not guaranteed.
 Depend on CPU’s characteristic, once you get instable scenario, please restore the
default settings for system.
 You can also check the core numbers in performance tab of Windows task
manager.
XXX Voltage [Auto] (optional)
Sets these voltages. If set to "Auto", BIOS will set these voltages automatically or you
can set it manually.
Spread Spectrum [Disabled]
This function reduces the EMI (Electromagnetic Interference) generated by modulating
clock generator pulses.
[Enabled] Enables the spread spectrum function to reduce the EMI
(Electromagnetic Interference) problem.
[Disabled] Enhances the overclocking ability of CPU Base clock.
Important
 If you do not have any EMI problem, leave the setting at [Disabled] for optimal
system stability and performance. But if you are plagued by EMI, select the value of
Spread Spectrum for EMI reduction.
 The greater the Spread Spectrum value is, the greater the EMI is reduced, and
the system will become less stable. For the most suitable Spread Spectrum value,
please consult your local EMI regulation.
 Remember to disable Spread Spectrum if you are overclocking because even a
slight jitter can introduce a temporary boost in clock speed which may just cause
your overclocked processor to lock up.