IBM x3690 X5 Service Manual page 360

3. Align the connectors on the power interposer card assembly so that they are
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System x3690 X5 Types 7147, 7148, 7149, and 7192: Problem Determination and Service Guide
facing the power supply cage and the power interposer card is also aligned
with the power interposer card connectors on the system board; then, press
down on the assembly until it is firmly seated in the connectors on the system
board.
Power supply
connector 3
Power supply
connector 4
Power interposer
card
Power cable
connector
Power header
connectors