It has 4 USB-3.0 ports and 12 USB-2.0 ports.
Half of the ports are available from connectors on the motherboard intended to have cables from the front of the case connected to them. There are 3 blue connectors labeled 7-8, 9-10, and 11-12. These are the USB 2.0 connectors and I have my front panel plugged into USB 7-8, so my front connectors are USB 2.0.
The internal connector for USB 3.0 is entirely different and at this time my case has no connector that would plug into it. It has more pins (not surprisingly) and at a higher density. I may have the appropriate connector someplace in a box of parts.
The back has 6 USB 2.0 ports and 2 USB-3.0 ports. The USB-3.0 ports are easy to find, they are under the ethernet cable and are blue. The four at the top of the case and the two next to those are all USB-2.0
I should plug my camera into the USB 3.0 ports.
The USB 2.0 ports are handled by the Intel Z68 chipset.
The USB 3.0 ports are handled by an ASMedia USB 3.0 controller.
On the back panel there are 4 USB 3.0/2.0 ports in the center (2 alongside of 2). The two ports near the top of the case (alongside the PS/2 keyboard connector) are also USB 3.0/2.0
Inside the case are 2 headers for USB 2.0 ports and (like the ASUS board above) a high density connector for USB 3.0. Since my case has no provisions for that USB 3.0 header, I am not using it.
A pair of VIA VL810 hubs handle 8 of the USB ports,
the other 6 are handled by the Intel Z77 chipset.
The diagram shows that the Z77 has 2 USB 3.0/2.0 and 4 USB 2.0.
Here is how that is partitioned out:
Chipset: 2 USB 3.0/2.0 on back panel (top) Chipset: 4 USB 2.0 on internal connectors VL810: 4 USB 3.0/2.0 on back panel VL810: 4 USB 3.0/2.0 on internal connector
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