I originally planned on doing a YouTube video, but decided against it. So, here goes: This SuperSpeed USB panel connects to a PCIExpress slot via a cable.
|Motherboard to device adapter|
|Cable end to adapter|
Now how this device is PCIExpress compliant is something I don't know. I do not have access to the PCIExpress specifications. The four port "hub" is connected by the aforementioned cable. The ends of the cable strangely say "USB 3.0" as no USB signals travel over it.
|The card reader part uses an Alcor Micro AU6477 flash memory controller. I could not find a specific datasheet for it but found one for the '75. I assume the '77 is just a revision that supports SDXC, and the pinouts are the same between the two.|
|The card reader was transplanted from my old frame into the new, but I had to do some cutting of the front faceplate to put everything back into alignment|