Intel Desktop Board DX79SI Technical Product Specification
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1.13.2.2 Fan Headers
The function/operation of the fan headers is as follows:
• The fans are on when the board is in the S0 state
• The fans are off when the board is off or in the S3, S4, or S5 state
• Each fan header is wired to a fan tachometer input of the hardware monitoring and
fan control SIO
• 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
• 4-pin fan headers are controlled by Pulse Width Modulation
For information about Refer to
The location of the fan headers Figure 13, page 48
The location of the fan headers and sensors for thermal monitoring Figure 7, page 31
1.13.2.3 LAN Wake Capabilities
CAUTION
For LAN wake capabilities, the +5 V standby line for the power supply must be capable
of providing adequate +5 V standby current. Failure to provide adequate standby
current when implementing LAN wake capabilities can damage the power supply.
LAN wake capabilities enable remote wake-up of the computer through a network.
The LAN subsystem PCI bus network adapter monitors network traffic at the Media
Independent Interface. Upon detecting a Magic Packet* frame, the LAN subsystem
asserts a wake-up signal that powers up the computer. Depending on the LAN
implementation, the board supports LAN wake capabilities with ACPI in the following
ways:
• The PCI Express WAKE# signal
• The PCI bus PME# signal for PCI 2.3 compliant LAN designs
By Ping
Magic Packet
• The onboard LAN subsystem
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