I need to replace the RAID controller in a server, and the new one is PCI Express while the old one was 64bit PCI. The server has both slots, but the riser card that was installed does not contain the PCI Express part.

So I bought a new 4x PCI Express riser card (Delock 89103), but the moment I put it into the slot the server does not start up at all. It does not even get to POST, at most the power LED flashed once but nothing else happens at all. It does not power up the server at all. If I remove the riser card it starts up fine.

If I put the riser card into a regular desktop computer it seems to work in general.

Is there anything else I have to pay attention to when buying a riser card? My naive assumption would be that any PCI Express riser card should work. Or is my riser card likely to be damaged or out-of-spec and the server is just more picky? How do I get it to work, or how can I at least find a riser card that will work with my server?

The server mainboard is a Super Micro PDSMi+.