4/21/2024 0 Comments Sata to molex connector![]() I want to use a single molex and use splitters for the rest of the drives.īelow is an image of the power supply I want to use for a 4 Bay NAS. I saw some posts about powering 2 HDD's from one molex, but I want to power 3-4 drives. So they just build the 6-pin cables with enough gauge for 150W and split the extra two wires at the very end.First question here. The specification says there has to be 8-pins (but nothing about how many wires) for the 150W line. It just moves the weak point to the PSU wires instead of the adapter.īTW, these specs are the reason the 6+2-pin PCI-E connectors exists. But the thing is, the Molex connectors on the PSU usually stem from a single wire. And even if there was, who's going to keep morons from daisy-chaining the adapters. The 2x Molex to 6-pin is actually technically fine since one Molex is 45W and the 6-pin PCI-E is 75W. I guess there's no law against connecting a plug to another with a few wires. That's the one that made the 80% minimum efficiency mandatory IIRC.Įdit: Oh, yeah, the adapters. ATX12V v2.4 I believe is the most recent but in consumer-grade stuff I most often see compliance with v2.31. The 45W-thing and 150W-thing and other stuff I'm omitting come from the ATX12V and Intel EPS12V specifications. Too much current though the too thin wire makes it heat up, melt the plastic insulation, the cores contact each other and you got a short on your hands. Until it burns out or burns your fingers. ![]() You know the trick with a single strand from a wire and a 9V battery? If you connect the strand to the leads, it gets hot enough to melt plastics and styrofoam. Things like the connectors and solder joints tend to be most at risk. As you probably know, higher wattage needs thicker cables so the cables for a 45W line can be pretty flimsy in comparison to 150W line cables. But waht the power supplies don't have is individual fuses for the internal DC rails. Some powersupplies have overcurrent protection that actually works and prevents catastrohies and so on. "Only a Sith deals in absolutes." The thing is, if a wire is rated for 45W, it can still handle more if it's made "too thick". ![]() By going with 3 pairs of wires, the current is even through each pair and the voltage drop is smaller, and in addition everything is also safer because if one of the contacts is loose or bad, there's still two other pairs capable of providing the full power the video card needs. But, at 6a going through a single pair of wires you may have 12v at the power supply but the video card only sees 11.8 or 11.9v at the connector due to the voltage drop on the cable (caused by the resistance of the wire itself). ![]() Ī 6 pin pci-e connector is meant to provide the video card with 75w ( 12v at about 6A) through three pairs of wires, but even a single pair of wires could actually provide those 75w safely. and Voltage drop are reasons there's more than a single pair of wire going to a pci-e connector. ![]() That's why the molex recommends to be maximum 45w ( 12v 3-4A or something like that, same for 5v), because power supplies could have a strip of 2-3 molex connectors and in total the strip could provide to 3 devices up to maximum safe current for that single yellow wire (3-4A per connector, times 3 connectors in the strip) There's also the issue of mating of connectors - there's often resistance at the contact, imperfect connections / oxidation / etc can cause electric arcs or overheating of the metal contacts/pins and potentially damage the connector if the current is too high. for AWG18 wires (the most often used in PC power supplies), the maximum recommended is about 8-10A in order to prevent the cables from heating and reduce the voltage drop on the cable due to internal wire resistance. The maximum current that can go to a device is limited by the diameter of the wire first of all. The value of 45w is more or less a recommendation, devices that are to be powered from a molex connector should be designed in such a way as to not consume more power than that value. Will all these destroy all the power supplies they are used on then?Ī molex connector isn't restricted to a particular amount of current. There are adapters going from 2xmolex ->6-pin Pci-e or even 8-pin pci-e. ![]()
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