HP 743 Series Technical Reference Manual For Oems page 133

Power Requirements
Power Distribution
Figure 6-3 GSC Expansion Adapter Power Distribution
6-4
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P2
GND
+5
P1
GND
–12
+12
+5
GND +3.3
+5 +12
GSC Connector
GND
–12
GSC Card
+12
Connector
+5
+3.3
GND
–12
GSC Card
+12
Connector
+5
+3.3
–12