The different connectors of a computer power supply:
The 6+2-pin, or 8-pin, PCIe power connector.
High end PCI Express (PCIe) graphics cards often need auxillary power. This power is delivered to the card via either a 6-pin PCIe connector or a 6-pin and 8-pin power connector.
PCI Express graphics cards without any kind of auxillary power connector are called "75W cards" because 75W is the most power the card can pull from' the PCI Express slot. A graphics card with one 6-pin PCIe power connector is called a "150W card" because the 6-pin allows the card to draw up to 150W of power. A graphics card with two 6-pin PCIe power connectors is called a "225W card" and a graphics card with one 6-pin PCIe and one 8-pin PCIe power connector is called a "300W card"
BFG power supplies use what is referred to as a "6+2-pin" PCIe power connector. This is because the power connectors have a removable pair of pins that converts an 8-pin PCIe connector into a 6-pin PCIe power connector.
This 6+2-pin power connector can be split for use with a 150W graphics card requiring a 6-pin PCIe power connector or combined for use with a 300W graphics card requiring an 8-pin power connector.
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