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 headerInternal 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.