Antec 500 - Manual (Page 5)

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Position 3: "Virtually Silent" mode. The fan will activate if the temperature
reaches 55°C inside the power supply. The fan will automatically
vary its speed in response to changing temperatures. Once the
temperature decreases below 55°C, the fan will turn off. We
recommend this mode if you're determined to have the quietest
power supply possible. (Obviously, we don't recommend this
setting for overclockers or gamers.)
To install your Phantom 500, follow these steps:
1. Disconnect the power cord from your old power supply.
2. Open your computer case. Follow the directions provided in your case manual.
3. Disconnect all the power connectors from the motherboard and from the
peripheral devices such as case fans, hard drives, floppy drives, etc.
4. Remove the existing power supply from your computer case and replace it
with the Phantom power supply. Attach the Phantom to your chassis with
the screws from your original supply.
Note: Install the Phantom carefully, because the edges of the power supply
are sharp.
5. Connect the 24-pin Main Power Connector and the 4-pin or 8-pin +12V
connector to your motherboard as needed. If your motherboard uses a
20-pin connector, detach the 4-pin attachment on the 24-pin power
connector (see pictures 1 and 2). Connect the peripheral power connectors
to devices such as hard drives, optical drives, etc.
6. Set your desired fan operating mode. (See above for details.)
7. Close your computer case.
8. Connect the power cord to the Phantom 500.
Picture 1 Picture 2
For 24-pin
motherboards
For 20-pin
motherboards