Rosewill RP550-2 - Manual (Page 9)

1. Installing Power Supply
Affix the power supply to the case with screws.
Installation
2. 20+4 pin Main Connector
Take the 20 pin connector.
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POWER SUPPLY
PERFORMANCE
Plug the 20 pin connector onto
the motherboard.
NOTE : 1. Confirm 20 pin or 24 pin main connector your motherboard needs before
the installation.
2. 4 pin here is used for switching between 20 & 24 pin only.
20 pin