Hp 561FLR-T  It has what looks like an offset pcie connector. 

Jake thought it wasn't real pcie and he was right.  Plug it in and nothing.  lspci shows nothing.  

The connector is actually "Flexible-LOM"    But someone has reverse engineered it and designed an adapter:  https://github.com/TobleMiner/HPE-FlexibleLOM-adapter  I got an adapter on Ebay 

which was probably copied from that github.  And it works.  Getting 8Gb up and down on Sonic Fiber.  

These cards are scavenged from old HP servers and you can get them cheap.  Like $20 for 2.  

But I found a regular pcie card: Supermicro AOC-STG-i2T which can be found for about $25 and 

doesn't need an adapter.  

Thomas