ASRock is the latest motherboard maker to adopt USB 3.1—and it claims to be the "first in the world" to offer reversible Type-C connectivity. The firm is rolling out the next-gen interface on a couple of Extreme6 motherboards for Intel processors.
The X99 Extreme6/3.1 features a single Type-C port in its rear cluster. On top of that, ASRock throws in a separate PCIe add-in card with dual Type-A connectors. The add-in card appears to be fueled by a separate USB 3.1 controller, likely the ASMedia ASM1142. ASRock's press release isn't specific about the exact configuration.
Instead of splitting SuperSpeed+ connectivity between separate solutions, the Z97 Extreme6/3.1 sticks to a single add-in card. This one has both connector types, so it's a little different from the "A+A" card that ships with the X99 board:
Note the different auxiliary power jacks; one is a four-pin floppy connector, while the other is standard Molex. ASRock says the ports can push 3A, which is good for 15W of 5V power.
The cards look identical apart from their internal and external connectors. Don't get too excited about the physical x4 connectors, though. The ASM1142 is the only USB 3.1 solution we've seen, and it's limited to a Gen2 x2 connection.