No, if you are using a Max Expansion cable adapter it will not be “seen” by the system. The cable adapters have redrivers and buffers for the PCIe signals and Ref clock and if you have the cable adapter cabled to an endpoint device, that device should show up in your system.
Frequently Asked Questions about common support issues for products you already own
The HIB25x8 adapter is a Gen2 adapter with a 40Gb/s bandwidth. It will only operate at that speed even though it’s installed in a x16 or x32 slot.