ATXN-5520 / ATXW-5520 Technical Reference
Motherboard Installation
3-5
Chassis Plans
Connecting Power
There are three system power connections required for the motherboard. Connector P17 accepts a 24-pin
standard ATX/EPS power supply connection, while P15 and P28 are 8-pin, +12V AUX input power
connectors. Single and dual-processor motherboard configurations require both auxiliary power
connections. The figure below illustrates the power connector locations on the motherboard. See Chapter
1 for detailed pin-out information on the power connectors.
Fan Headers
Four fan headers are available for connecting system fans. These four-pin headers support a fan speed
control line. Four-pin fans feature the speed control line; however, the motherboard‟s fan header design
also accommodates 3-pin fans without speed control. The figure below shows the system fan header
locations on the motherboard. See the Motherboard Connectors section in Chapter 1 for detailed fan header
pin-out information.
