Good day to all the owners of servers who are still engaged in them and not sold / not thrown this iron. I will share my successes and failures. I apologize for the quality of the photo - photo, "photographed on a pack of cigarettes," as we here joke wits.
The biggest success - I was able to get 3 expansion slots on my server for the C6220 II server, both near the power button and the far one for the graphics processor called the Edge Slot.
As you can see in the slots pts-e 16h I have Tesla K20 + M2 SSD on the adapter. And on the riser for GP GPU I have GT 610. cable - additional power of risers and boards. Everything is determined, the slots in the BIOS are shown as being used and running when the operating system is loaded and the drivers are installed.
In order for all this to work, you need two components - additional power for risers and a board and the correct configuration of the BIOS server.
Entering the BIOS, you must go to the marked line in the photo and enter the menu where you can not put all the items in the position, otherwise your slots will not work, so it was like on the second photo.
After that, you will see the line PCI Slot Configuration - where the slots of your server are indicated. Next, we put the cards you need through the adapters and use it.
But there is one more thing - the server uses proprietary risers with additional power, if you include more than one card in the server through risers without additional power - there may be problems, defenses will most likely work and you will long to understand why everything does not work. Or in the worst case, something will burn from overload. It is better not to take chances.