Need internal power cable

Hi,
I wish to install a USB 3.0 expansion PCIe card in my early 2008 Mac Pro (3,1). The card has a 4 pin Molex power connector; I think it's same connector one finds for power on a parallel IDE drive. I believe I need to connect this to the 6 pin connector on my motherboard? Anyone know where I can get a cable?
(PS: I posted this earlier, by mistake, in the iMac forum. So this is a duplicate posting. Apologies!!!)

Grant Bennet-Alder wrote:
Mac Pro 3,1 is the 2008 model with Molex connectors.
Mac Pro 4,1 is the 2009 model with SATA cabling ONLY, so it would require a different cable.
After powering off, the Optical drive enclosure is really easy to remove halfway to inspect and/or disconnect the cables (no fasteners required). Once the cables are disconnected from the drives, it can be completely removed and you can stretch out the cables and see if they will fall short, and estimate how much more would be needed.
I am sure 72" is far more than you need -- they may even reach already.
Thanks, Grant. I will examine the connections. My project is to add USB 3.0 card reader or other devices to the PCI expansion card I'm planning to get.
Do you know if there are two separate DVD/CD drive power cables in the stock Mac Pro 3,1 or just a single with a Y cable between them? That is the model I have. If only one cable of the two used there, can stretch out the other one, then I'd be golden- nothing to add.
However, I suspect that there is a Y cable there for the second DVD drive, so I would need to connect to it and extend it down to the PCI card residing in the X4 PCIe port. Yes, 6' is overkill but I can eat some up by routing the cable neatly, the rest will bundle. Probably 48" would be sufficient. That costs more to make than it is worth.
When I take it apart, I can post pictures for anyone interested. FYI, recently put in an external antenna for the BT antenna to prevent/minimize interference with USB 3.0. Made a big improvement in level of the trackpad reception, too. USB crosstalk should be reduced and cable pickup will be reduced with the RF suppressors I used on the extension cable from the USB card reader to the card.

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