ASRock P55 Extreme4 has four USB 3.0 ports

Designed to be a notch above the P55 Deluxe3, which packs two SATA 6 Gb/s and two USB 3.0 ports, the Extreme4 uses two 2-port controllers to drive four SATA 6 Gb/s ports, and two USB 3.0 controllers to drive two USB 3.0 ports on the rear panel, and two ports by internal headers (for the latest cases that come with USB 3.0 front-panel ports, or simply by USB 3.0 expansion brackets). Connections to these four controllers is conveniently handled by configuring the PCI-Express x4 port from the P55 PCH to work as four x1 ports, apart from the four x1 ports it gives apart from the x4 port. This way, the board is also able to provide three x1 expansion slots and drive the PCI-E GbE controller.