This is a part from an IBM server dated 2008 that I want to reuse in my new computer. It essentially converts from 1 SAS port to 4 SATA ports. I’ll use the raid card to connect to it via SAS, but I do not know what the power port is and what the connector on the top is either
The one at the top could also be a connector for a serial port for debugging or so.
+1 on that. The User’s guide of a similar device (source) mentions a 10-pin CPLD connector Reserved for IBM use
As often with IBM, everything is proprietary 😅