Is It Necessary to Connect the Power Connector on My M or X Series PCIe Card?

Updated Jun 26, 2019

Reported In


  • PXIe-6363

Issue Details

I am installing an M or X Series PCIe card into my computer and noticed that there is a power connector on the card. I thought PCIe ports provided the necessary voltage and current to power the card. Do I need to connect the board to my power supply?


In most cases, it is not necessary to connect your PCIe card to your power supply using the auxiliary power connector.

The disk drive power connector is a 4-pin hard drive connector on PCI Express boards that, when connected, increases the current the board can supply on the +5 V terminal.

For most applications, you do not need to install the disk drive power connector. However, you should install the disk drive power connector in either of the following situations:
  • You need more power than listed in the device specifications
  • You are using an SCC or SC Express accessory without an external power supply, such as the SC-2345
If you decide to use the disk drive power connector, you should attach it by:
  1. Power off and unplug your computer.
  2. Attach the PC disk drive power connector (1) to the disk drive power connector on the board (2).
  3. Do not use a power connector that is in the same power chain as your computer’s hard drive.
  4. Replace the computer cover, if applicable.
  5. Plug in and power on your computer.

Additional Information

The image in the solution shows a 4-pin Molex connector, but it should be noted that your board may have any of the following connector types:
  • 4-pin Molex
  • 34-pin IDE
  • 15-pin SATA
In the event that your mother board does not have the same connector type as your card, adapters between any of these connectors should be readily available from any supplier or retailer of PC components.


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