If you have a modular power supply that is one that uses detachable keyboards to provide power to different
mixtures of PCIe and SATA hard disks, you need to determine the power connectors you need and attach
the appropriate modular power leads.
For example, if the power supply has a built in PCI times 16 connector for a high performance video
card, but you are using two cards that require additional power.
Connect a modular PCI times 16 Power Lead.
The power supply is easy to install and it's usually attaches to the chassis with four screws.
ATX style motherboards have a 20 or 24 pin main power connector, plus a four or eight principal connector.
Both are key, so they can only go in one way to attach the power connectors from the power supply to
the motherboard.
Do the following.
Plug the 24 pin or 20 pin Main ATX Key Power Supply connector into the motherboard power socket.
You can plug it 20 pin connector into a 24 pin circuit and vice versa by connecting them in an offset
fashion.
Or you can use cable adapters to meet them up.
Most ATX systems use a 4.8 x 12 volt or eight pin IPS 12 volt connector.
Connect a power lead from the power supply to the CPU fund if the motherboard does not have a CPU fund
Power connector.