VIA 693/693A Twin Processor Mainboard
INSTALLATION
3-18
(G) JP12: CPU Voltage Range Selection
(Optional)
JP12 is a special design on the mainboard. JP12 allows you to select the CPU core
voltage range (Vcore) to protect the CPU.
The voltage regulator on the mainboard will generate 1.3V ~ 3.5V DC to support
different processors. Basically, most mainboards will use the CPU VID signal
(VID0~VID4) from the CPU to decide the proper CPU core voltage (Vcore). In
case that there is the poor connection between CPU and its socket, 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 and the mainboard.
JP12 is designed to control the Vcore within the safe range so that it won't make
any damage to the CPU or mainbord because of wrong VID signal.
Since most Pentium II/!!! processors require the Vcore below 2.05V except few
Pentium II processors. So the default setting of JP12 will control the Vcore
between 1.3V and 2.05V so that the CPU and mainboard will have a good
protection. Please do not change the setting on JP12 unless your CPU needs the
voltage higher than 2.05V.
OPEN: Vcore = 1.3V ~ 2.05V
SHORT : Vcore = 1.3V ~ 3.5V.
+
1
2
3
4
JP12
