Thanks a million to the senior posters here who replied, yeap the PCI adaptors are cables, I am trying to find a picture of the interior of the 2U. But it is something like
Power supply is normally quite high at least 750W to accomodate the Raid 5 etc.
750 sounds good but without knowing the amperage distribution not very helpful, are these still equiped with the raid drives? One card horizontal is a given, two might be possible depending on the specifics of your units.