There are (obviously) some boo-boos in the GA board's TPS...
The Z77 chipset provides ten USB 2.0 ports and four USB 3.0 ports. These USB 2.0 ports are consumed as follows:
- Six of the USB 2.0 ports are used for front panel USB 2.0 (two black headers and one yellow header; each header provides two 2 USB 2.0 ports).
- Four USB 2.0 ports are used for pack panel USB 2.0 (two black and two yellow ports).
The GA board also utilizes two 4-port USB 3.0 hub ICs. This supports the four front panel USB 3.0 ports (the two blue connectors) and the four back panel USB 3.0 ports.
[Aside: Ok, you just did the math and you see a discrepancy. The hubs each consume one of the chipset's USB 3.0 ports. That means that there should have been a total of ten USB 3.0 ports available (two from the chipset and eight from the hubs). In fact, however, only three of the ports from each hub are actually utilized.]
Bottom line, you have ten USB 2.0 ports and eight USB 3.0 ports. Black USB 2.0 ports provide 500mA of power to devices, blue USB 3.0 ports provide 900mA of power to devices and yellow USB 2.0 charging ports provide 1500mA of power top devices - and yes, they all support data and they are all independent.