Rosewill RP550-2 - Manual (Page 12)

8. Before starting your system
• Select the proper voltage setting.
(US = 115V)
• Attach the power cord to the power supply
• Confirm the power supply is on
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POWER SUPPLY
PERFORMANCE
• Connect the power cord to a power
source.
11
ON OFF
• Select the Fan Speed setting.
1=T= Fastest Speed (Great cooling but noisy)
2=A= Auto Control (Recommended)
3=L= Slowest Speed (Silent but bad cooling, NOT recommended)
NOTE : Slowest Fan Speed may make the power supply & your system UN-stable.