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Step 6 Connect Power Supply
The Megaplex motherboard is designed to fit in a custom-built chassis. The
Megaplex requires four ATX-style power connectors. Make sure that the power
switch is Off before assembly. Before attaching all components, make sure that
the proper voltage has been selected. Power supplies often can run on a wide
range of voltages and must be set (usually via a switch) to the proper range.
ATX Power Connectors Attach the power supply cables to the ATXPS power connectors on the
motherboard, and the memory card.
Pin
Signal Description
1
2
3
4
5
6
7
8
9
5VSB (not used by Megaplex)
10
Power Requirements At a minimum, one power supply generating 95 amps at +5V and 62 amps
at +3.3V must be used. A 1000 watt power supply generating 100 amps at +5V,
65 amps at 3.3V, and 20 amps at +12V is recommended.
26
Megaplex Quad Pentium II Xeon PCI ISA System Guide
Pin
3.3V
11
3.3V
12
GND
13
+5V
14
PSON (not used by the Megaplex.
GND
15
+5V
16
GND
17
NC
18
19
+12V
20
Signal Description
3.3V
-12V
GND
The power supply must turn on
without these signals).
GND
GND
GND
-5V
+5V
+5V
Cont'd
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