This adapter allows you to connect older PC Power Supplies with 6pin PCI Express (PCIE) Connectors only to newer 8Pin PCIE Graphics cards. If you use 1 x 6pin connector only the adapter will also function but only up to 75 watts, when 2 x 6pin connectors connected it will function up to 150w which is needed by most 8pin PCIE Connector graphics cards.
The 6 pin is only rated for 75 watts while the 8 pin is rated for 150 watts. This adapter combines 2x6 pins in case the device using the 8 pin draws more power than the single 6 pin can handle.
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