Just to confirm, you're actually looking for a modular cable of molex connectors for your PSU, right?

A 6-pin PCIe (female) to 3x 4-pin molex (male) passive adapter would be an unusual item, since all of the molex connectors would be missing the 5V line.


The PSU end of modular power cables are not standardized well, and 6-pin PCIe power connectors are distinct from the 6-pin connections on the side of a modular PSU.