XFX 8800GT in a Mac Pro - how to connect to the power supply

I want to install a XFX Geforce 8800GT in a 2008-Mac Pro (running Vista only; no boot camp). Where can I get the necessary power cable to connect the card to the Mac?
I know that there are two non-standard(?) 6-pin power connectors on the main board, which are meant to connect those “booster cables” to. I know that these cables are available via mail order (e.g. from ATI for approx. $13). I also know that Apple’s support is not very helpful with questions around non-supported hardware.
*Here’s the problem:* Instead of two 6-pin molex connectors this card has only one, but requires the use of a special Y adapter to connect to two 4-pin molex plugs (as seen here: http://www.com-tra.de/img/p/06759_o.jpg).
*My question:* What is the proper way to connect this graphics card to the machine? Is there a matching cable available somewhere? Could I perhaps simply use two booster cables and a 6-pin molex Y-adapter? What about getting the power from somewhere else, e.g. optical drives?
Any help is much appreciated!

It depends on whether XFX's GeForce 8800 GT is overclocked and what the demands of the fan assembly might be.
It's really easy to find out. When I just connected one power feed to Radeon HD 3870 X2, it didn't show up to Vista 64 (while the Radeon HD 2600 XT which was also installed was clearly recognized).
I shutdown, added the second power lead, and powered up. This time it showed up.
Also, sometimes you will get an audible alarm if the card is deficient on power - especially if it's the only GPU installed.
In the case of the HD 3870 X2, instead of a "Y" connector, I used both Apple proprietary power feeds that were connected to the motherboard's PCIe 6 pin power sources. You can use an external power source (like an ATX power supply) if you run short of power sources but then you can't put the side cover on.

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    Message was edited by: Theo77

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