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Fan speed controllers and sensors are integrated into the legacy I/O controller. • Thermal sensors in the processor and Intel P67 PCH, as well as near the processor voltage regulators and system memory. • Monitoring of system voltages to detect levels above or below acceptable values • Thermally monitored closed-loop fan control for all fans that can adjust fan speed as needed. Fan Monitoring Fan monitoring can be observed via the BIOS Setup program, Intel® Desktop Utilities, or third-party software. Desktop Board Features Chassis Intrusion The board supports a chassis security feature that detects if the chassis cover has been removed. The security feature uses a mechanical switch on the chassis that can be connected to the chassis intrusion header on the Desktop Board. See Figure 1 for the location of the chassis intrusion header. Power Management Power management is implemented at several levels, including software support through the Advanced Configuration and Power Interface (ACPI) and the following hardware support: • Power connectors • Fan headers • LAN wake capabilities • Instantly Available PC technology (Suspend to RAM) • +5 V standby power indicator LED • Wake from USB • PCI Express WAKE# signal support • Wake from CIR Software Support ACPI ACPI gives the operating system direct control over the power management and Plug and Play functions of a computer. The use of ACPI with the Desktop Board requires an operating system that provides full ACPI support. Hardware Support Power Connectors ATX12V-compliant power supplies can turn off the computer power through system control. When an ACPI-enabled computer receives the correct command, the power supply removes all non-standby voltages. When resuming from an AC power failure, the computer returns to the power state it was in before power was interrupted (either on or off). The computer’s response can be set by using the Last Power State feature in the BIOS Setup program’s Boot menu. The Desktop Board has two power connectors. See Figure 23 on page 49 for the location of the power connectors. Intel Desktop Board DP67DE Product Guide Fan Headers The function/operation of the fans is as follows: • The fans are on when the board is in the ACPI S0 state. • The fans are off when the computer is in the ACPI S3, S4, or S5 state. • Each fan header is wired to a tachometer input. • All fan headers support closed-loop fan control that can adjust the fan speed or switch the fan on or off as needed. • All fan headers have a +12 V DC connection (up to 12 V DC when using 3-wire chassis fans). • All fan headers are controlled by Pulse Width Modulation. • The chassis fan header supports linear fan control on 3-wire fans. The Desktop Board has a 4-pin processor fan header and two 4-pin chassis fan headers compatible with 4-wire and 3-wire chassis fans. LAN Wake Capabilities CAUTION For LAN wake capabilities, the 5 V standby line for the power supply must be capable of delivering adequate +5 V standby current. Failure to provide adequate standby current when using this feature can damage the power supply. LAN wakeup capabilities enable remote wake-up of the computer through a network. The LAN subsystem monitors network traffic and upon detecting a Magic Packet* frame, it asserts a wake-up signal that powers up the computer. Instantly Available PC Technology CAUTION For Instantly Available PC technology, the 5 V standby line for the power supply must be capable of delivering adequate +5 V standby current. Failure to provide adequate standby current when using this feature can damage the power supply and/or effect ACPI S3 sleep state functionality. Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to- RAM) sleep state. Instantly Available PC technology enables the board to enter the ACPI S3 (Suspend-to-RAM) sleep-state. While in the S3 sleep-state, the computer will appear to be off (the power supply is off and the front panel power LED will behave as configured by the BIOS “S3 State Indicator” option). When signaled by a wake-up device or event, the system quickly returns to its last known wake state. When signaled by a wake-up device or event, the computer quickly returns to its last known awake state. Desktop Board Features The Desktop Board supports the PCI Bus Power Management Interface Specification. Add-in cards that support this specification can participate in power management and can be used to wake the computer. The use of Instantly Available PC technology requires operating system support and PCI 2.2 compliant add-in cards, PCI Express add-in cards, and drivers. +5 V Standby Power Indicator LED CAUTION If the AC power has been switched off and the standby power indicator is still lit, disconnect the power cord before installing or removing any devices connected to the board. Failure to do so could damage the board and any attached devices. The Desktop Board’s standby power indicator, shown in Figure 3, is lit when there is stand...