I've been working on my new PC build with the GA-Z77X-UD5H-WB WIFI motherboard. This board comes with a wifi/bluetooth card that goes into a PCIe x1 slot... but the card also wants to be connected to the motherboard through an internal USB cable:
to a motherboard USB2 header. This would be fine and dandy but this motherboard only has two USB2 headers and they're already occupied by my case front panel USB pin blocks. However, there are at least two USB3.0 headers free on the motherboard; can I just connect this internal cable to a USB3 header?
Pictured: USB3.0 header (middle, light blue), USB2 header (right, blue) (not my motherboard)
Looking at pinouts and discussions online, it seems like it could work if I connect the USB2 pin block to the first 9 pins of the USB3.0 header, though I'm afraid of frying the wireless card, motherboard, or both. Some sites even say that the USB3.0 motherboard header isn't standard, and can vary in pinout depending on manufacturer! Can anyone shed some light on this?
P.S. If I can't do this, then is there a way to 'split' my existing USB2 motherboad headers?