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Chapter 2
AT7/AT7E
2-10
(2). FAN1, FAN2, FAN3, FAN4 and FAN5 Headers
Attach the connector from the processor fan to the
header named FAN1 or FAN2 and connector from
the front chassis fan to the header FAN4. Attach the
connector from the power fan or back chassis fan to
FAN3 header and attache the connector from
northbridge fan to the header named FAN5. You
must attach the processor fan to the processor, or
your processor will work abnormally or may be
damaged by overheating. To prevent the computer
chassis internal temperature from getting too high,
also connect the chassis fan.
Note: Watch the pin position and the orientation
(3). SMB1: System Management Bus (SM-Bus) Header
This header is reserved for the system management
bus (SM-Bus). The SM-Bus is a specific
implementation of an I
2
C bus. I
2
C is a multi-master
bus, this means that multiple chips can be connected
to the same bus and each one can act as a master by
initiating a data transfer. If more than one master
simultaneously tries to control the bus, an arbitration
procedure decides which master gets priority. You
can connect the devices which utilizes the SM-Bus.
Note: Watch the pin position and the orientation