![]() A 12V device like a fan would only draw on the 12V yellow+black cables, which just so happen to align with the pin-out. In some events, like our above image, you may end up fine. Mixing a SilverStone PSU cable, as shown in our above video, with an EVGA PSU would also be incompatible. a $15 unit that operates at half its rated wattage, could flame-out more visibly.Īnd just for clarity, EVGA isn't the only company that makes these cables that will physically (but not electrically) work with competition. It's often something forgotten - like the EPS12V cable - but could be a bad cable, too.Ī bad power supply will fail in a spectacular manner, often with a spark and internal damage. If a system fails to boot, we would recommend immediately flipping the PSU's switch to off, then double-check everything in the system. Mixed cables just happen to align a paired 12V with the PSU.)Ī half-decent power supply will leverage its protections to try and prevent any sort of short-circuit or over-voltage/current scenario, but those protections only work so well. This leaves the PSU to protect itself with whatever mechanisms it has available (generally, PSUs will use OCP or OVP for such an event). Were we to connect cable "B," the EVGA MOLEX cable, we actually end up with reverse polarity. The PSU wants to push 5V through its bottom-right pin, from this perspective, and the specified cable wants to pull its 5V supply from the paired bottom-right and top-left red & black cables. With this particular pin-out, connecting a 5V device (like an SSD or 2.5" laptop HDD) would result in nothing we want. It depends on what device is hooked to the peripheral connector (MOLEX or SATA). ![]() The bottom left is its anticipated and specified connector, and the bottom right is a connector from an EVGA PSU which is physically compatible, but not electrically compatible.Ĭonnecting these two ends, PSU "A" to Cable "B," we could end up with a catastrophic result - or be perfectly fine. The top pin-out is the PSU-side (where the modular cable connects), looking at it straight on. Electricity is not a mystery we know well how it works, and crossing the wrong wires will damage components.Ībove is a pin-out chart that we made, depicting two actual pin-outs for cables which are seemingly compatible. Like ESD, just because you've gotten away with mixing cables doesn't mean you always will. ![]() Not always, but it can - and when the wiring crosses in exactly the wrong way, the failure will be spectacular. Mixing cables between power supplies can kill them or kill attached components. What can't be done, though, is mixing cables between all these units. Another still could use a bulky 9-pin block for universal connectivity, like some of EVGA's power supplies. Some vendors might use 6-pin connectors for their PSU-side peripheral headers (identical to what's found on PCI-e cables, because it saves cost), others will opt instead for a wide-format pin-out for the same. What isn't standardized, however, is the layout of the PSU-side modular cable headers. ATX 24-pin, EPS12V, PCI-e to the GPU, SATA-the wiring is known, and it doesn't change. The device-side of all PC cables is standardized. ![]() There are two ends to a power supply cable: The device-side and the PSU-side.
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