So I picked up an M.2 to PCIe adapter and tried a few PCIe devices, and none of them work. The main device I wanted to use was one of my PCIe NVMe drives, but when I plug that device in the Odyssey will power up and power down. Never gets into a post at all - and I do have power to the PCIe adapter from an external source.
It may be the adapter itself - has anyone tied an adapter yet? Any success?