Supermicro support responded and confirmed, what we knew, that the PDB-PT846-8824 does not support PCIe 6-pin/8-pin.
They recommended me the PDB-PT747-4648 to gain the PCIe support. (as
@NablaSquaredG suggested in the first reply to this thread) ;-)
why "but" ?
what do you need more ? without the table you can "see" what connectors are there....
The main reason is that I'm not that "learned" into modding and want to be 100% before going into something that could, if done wrong, potentially burn down my house.