Usb 3.0 usb pci speed

Is a 3.0 usb pci card going to be just as fast as a mobo us 3.0 port or will the speed be between 2.0 and 3.0?
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More about speed
  1. It depends on what kind of PCIe interface the card has. A single-lane PCIe V1.x interface has a throughput of 250MByte/sec, so that would limit the potential maximum speed of the card. But keep in mind that even the fastest USB 3.0 hard drive will only have a maximum transfer rate of somewhere around 150MByte/sec, not matter how the USB 3.0 port is connected to the system.
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