Using XHCI, there are no predefined SMBIOS XHCI identities (like iMac17,1 or iMacPro1,1) in Apple's AppleUSBXHCIPCI.kext, thus without any working USB port limit patch, USB3.0 devices usually will not work in most of the USB3.0 ports, as most of the SS-ports will not be implemented (SS-ports...