The old style 4 pin molex power connector was on some earlier SATA 2.5 in drives but it isn't part of the SATA standard.
Both drives you have pictured have the SATA connectors on them. The 7 pin connector is the for the data cable and the 15 pin connector is for the power cable. The internal bay in the laptop will use these connectors not the molex.
Are you trying to put the Scorpio drive into the Dell and it won't fit? If that is the case, then it could be that the molex connector is causing an obstruction.