Board looks like an X10DRT-H in a sled for a quad twin.
It appears as if the sata power is plugged into the backplane adapter card that runs vertically along the near side of the sled. However, the two options for this board (basic and with sas hba) don't appear to have power connections although I can't find a decent pic of the sas version with a quick search.
Maybe a custom approach as it seems unusual to put a drive in there like that instead of the front bays.