The RM750e is fully modular. You can see the specs here. The list of cables included is at the bottom of the page, including a 4x 4-pin PATA cable. All the unused cables (which is most of them) are included in the box of extras for the HL15 variants with PSU. Note, though, that molex cable isn’t actually the one used in the full build. For the full build they have some custom cables so they can power the four connectors from different harnesses on the PSU and have better cable management. You can see this thread for more detail.
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