So I bought a rosewill 2-port USB 3.0 superspeed PCIe card and a mybook usb 3.0 WD hard drive and got all of them installed today and I am not having the transfer speeds that everyone claims you get. I hooked up the add-in card and plugged it into my power supply and booted up and installed all the necessary drivers for the drive to work. Then I plugged in my usb 3.0 external and updated the firmware on that to the latest version. I am still only getting about 45mbs on transfer. Everyone else is claiming about 127mbs on transfers.
If there something I need to do to increase my file transfer speed?