Intel DH57DD Intel Desktop Board DH57DD Product Guide English - Page 23
Hardware Support, Power Connectors, Fan Headers, LAN Wake Capabilities
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Desktop Board Features 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 25 on page 53 for the location of the power connectors. Fan Headers The function/operation of the fans is as follows: • The fans are on when the board is in the ACPI S0 or S1 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. 23