YB3x with a PCIe Slot for Add-On Card
The AOC version of the YB3x adds an 8-lane PCIe 3.0 slot for Full Height Half Length (FHHL) Add On Card (AOC).
Any YB3x model can have the AOC option.
x16 PCIe cards can fit into the AOC slot.
The image shows an x16, quad M.2 SSD card.
The AOC enclosure allows an easy access to the AOC while keeping the YB3x intact.