Ultra 440BX ATX Mainboard
INSTALLATION
3-16
This mainboard will detect the CPU type and choose the proper CPU voltage.
Incase that you feel like to adjust the CPU voltage higher then what is detected by
the mainboard. You may use JP11 to adjust the CPU voltage. When "SHORT" is
selected, the CPU voltage will be 0.05V higher than normal voltage.
OPEN: Normal Default Setting.
SHORT : CPU Voltage 0.05V increased.
JP11
DIMM3
BIOS
DIMM2
DIMM1
+
(D) JP12: CPU Voltage Range Selection
(Optional)
JP12 is a special design on the mainboard which allows you to select the CPU
voltage range (Vcore) to protect the processor from damage by accident.
The voltage regulator on the mainboard will generate 1.3V ~ 3.5V DC to support
different processors. Basically, Most Pentium II mainboards will use the VID
signal (VID0~VID4) from the processor to decide the proper CPU voltage
(Vcore). In case that there is the poor connection between Slot 1 connector and
CPU, or uninstall the CPU from the mainboard while the system power is "ON".
Under such circumstance, mainboard may receive wrong VID signal and send
wrong Vcore to the CPU. Unfortunately, wrong Vcore may destroy the CPU.
JP12 is designed to control the Vcore within the safe range so that it won't make
any damage to the CPU because of wrong VID signal.
Since most Pentium II/III processors require the Vcore below 2.05V except few
Pentium II processors. So the default setting of JP12 will limit the Vcore at
1.3V~2.05V. Please do not change the setting on JP12 unless your CPU needs the
voltage higher than 2.05V.
