Powering a 3rd internal SATA drive?

[Robo]

OK, I have one of OWC's SATA PCI cards in my DP G5 (PCI-X). The card has 2 ports which can be used (2-internal, 2-external used in any combo). I have an external attatched to a powered case, but how the heck do I power the thing internally to add an internal drive? On my G4, there was the obvious power connector. Where is it in the G5? Is this the cable I need? Any help appreciated!

http://eshop.macsales.com/item/Micro%20A...es/SATAPA/