Antec HCG M SERIES HCG-520M - Manual (Page 6)

4. Connect extra cables from the cable pack to the sockets on the power supply only if needed. If you are going
to plug the PCI-E cables into the PSU, they should go into the red sockets. If the red sockets are not being used
for PCI-E, then they can be used for any other type of cable supplied in the pack that accompanies the PSU.
5. Connect the AC power cord to the power supply AC inlet. Be sure to use the heavy-duty cord supplied with
your PSU.
6. PCI-E graphics cards use different amounts of power. For some, a single 6-pin connector is sufficient, making
the hardwired connector the preferred choice. More powerful cards use multiple connectors, including the
advanced 8-pin PCI-E connector. The 8-pin PCI-E connector on the PSU can be used as either a 6- or 8-pin
connector.