What is a molex connector4/16/2024 PN# 39-01-2240 or equivalent" - another, different, "Molex" power connector. A Molex connector is a versatile component that can be used to connect a wide range of devices. Note also that the main 24-pin power connector (§ 4.2.1) is specified as "Molex* Housing: 24 Pin Molex Mini-Fit Jr. Note that AMP and Molex are two different manufacturers, and those are just part numbers. The ATX power supply specification actually refers (§ 4.2.2) to them as a " peripheral connector", specified as "AMP* 1-480424-0 or Molex* 15-24-4048 or equivalent". Your first pictured connector is actually a PATA/IDE ribbon data cable. Despite the different names, they are the same thing. Therefore, a power connector referred to as a "PATA" or "IDE" power connector is likely to be a "Molex 4-pin power connector" or "peripheral power connector" and looks like your latter pictures. yes molex is the big fat 4 pins in a line connector. It has contacts for only the +VDC and Ground lines, since thats all the fan can use. It was most commonly used with pre-SATA hard drives, which are nowadays referred to as PATA (previously called IDE) drives. This adapter has a standard 3-pin female fan connector on one end to plug into any mobo header, and a standard 4-pin female Molex on the other end to connect to your fans cable. The 4-pin power connector that is commonly called a "Molex connector" is really more a general purpose peripheral power connector that delivers 12 V and 5 V power. Including the main 24-pin ATX motherboard power connector! And companies other than Molex also make the connector you know as a "Molex connector", notably AMP but also many unbranded/generic ones are also available. "Molex connector" is actually a rather imprecise term, since the Molex company makes many, many different connectors. The three-pin version (non-PWM) is referred to by some computer technicians as a TX3 connector, but this is something of a misnomer (similar to the moniker Molex connector, referring to the once-common 4-pin ATX power connectors originally produced by AMP).
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