USB 3.0 PCI-e Card Power


hi all, have 2008 mac pro (macpro3,1). installed usb 3.0 pci-e card, needs powered sata connection. not know how power up. places online seem mention using power second optical drive, have 2 optical drives in mac pro. there other way use sata power? have still have 1 empty hard drive bay, i'm not sure if can use that. i'm hoping wouldn't need to, because planning install hard drive in near future.
thanks...
 

you use 2 power cable adapters:
1. molex splitter, behind 1 of optical drives:
[​img]

, 2. molex sata extender usb card (make sure it's long enough):
[​img]
 


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