46PCA-6275 User's Manual4.1 IntroductionOn-board security (OBS) functions monitor key hardware. They helpyou maintain your system's stability and durability.The PCA-6275 can monitor 5 sets of system positive voltages, 2 setsof system negative voltages, CPU cooling fan speed, and CPUtemperature.The positive system voltage sets which can be monitored include:• CPU core voltage: 1.7 V ~ 3.3 V, according to Intel specifications• Transmission voltage from CPU to chipset: typically 1.5 V• Chipset voltage: typically 3.3 V• Main voltage: +5 V, +12 VThe negative system voltage sets which can be monitored include:• Main voltage: -5 V, -12 V4.2 Installation of OBS DevicesAfter you have mounted the CPU and cooling modules, enable theOBS functions as follows:1. Take the specially designed temperature sensor cables out of theaccessories bag.2. Connect the 2-pin header of each cable to connector RT1 and RT2respectively.3. Attach the sticker to the heat sink, but NOT on the plastic portionof the heat sink.4. Place the sensor on the nearest part of the CPU, to ensure that trueCPU temperature is measured.
