Given two motherboards, suppose these are the specs they list regarding USB.
The first one (Gigabyte GA-H67MA-UD2H-B3):
Chipset:
Up to 14 USB 2.0/1.1 ports (4 on the back panel, 10 via the USB brackets connected to the internal USB headers)
Renesas D720200 chip:
Up to 2 USB 3.0/2.0 ports on the back panel.
Internal I/O connectors:
5 x USB 2.0/1.1 headers
The second one (Gigabyte GA-Z68MX-UD2H-B3):
Chipset:
Up to 14 USB 2.0/1.1 ports (4 on the back panel, 10 via the USB brackets connected to the internal USB headers)
2 x Etron EJ168 chips:
Up to 4 USB 3.0/2.0 ports (2 on the back panel, 2 via the USB bracket connected to the internal USB header
Internal I/O connectors:
5 x USB 2.0/1.1 headers
1 x USB 3.0/2.0 header
The question: Does the first one have USB 3.0, or is it just "3.0 compatible," or something? How many ports do each have and are they actually in parallel or in series? Basically I'm looking to figure out how much parallel bandwidth each motherboard has.
Answer
It seems a bit silly/badly written, but, from the specifications, I understand that:
Gigabyte GA-H67MA-UD2H-B3 has 2 USB 3 ports on the back which are backwards compatible to USB 2.
Gigabyte GA-Z68MX-UD2H-B3 has 2 USB 3 ports on the back which are backwards compatible to USB 2. In addition, it contains 2 headers on the motherboard for an additional 2 backwards compatible USB 3 ports - so, if you get a case or media card bay/similar with USB 3 ports, you can use that header and get (up to) a couple of extra ports.
edit as per comments--
It is not guaranteed, but, on the second motherboard, you may get 1x back panel with 2x USB 2.0 sockets, or/and 1x front panel with 2x USB 3 (Backwards compatible with USB 2).
This is in addition to what I wrote above.
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