Can Win7 32-bit power USB 3.0?

Do I have to use a USB 3.0 card in the PCI-E x1 slot in the back or can it be front mounted and plugged into the floppy drive connector?  I didn't see a reference in the Tech Guide as to how many pins the floppy drive connector is.  Google said 34 pins, so I bet not.

Suggestions and recommendations welcome in case there's anything else I need to know.  If I have to mount it in the back, I can always use a USB 3.0 extension cord and hub. 

I found one other ref. in this forum, but it didn't have any answers I was looking for.