![]() If you're not afraid of electricity, then there's a good chance that you don't understand it and should do more research before messing with it. "Step 6" ~ Sources & further reading Requisite Disclaimer: Electricity is scary (where fear is equal to voltage x amperage / ). "Step 5" ~ Tips, tricks, warnings, anomalies, and conspiracy theories "Step 4" ~ A chart of wire-associations on other connectors (molex, floppy, PCI-e power, etc.) "Step 3" ~ A chart of wire-associations on ATX connectors "Step 2" ~ A list of standard wire-colors and functions in an ATX PSU "Step 1" ~ Some background information and suggestions for projects If you want a greater depth of information, see Step 6. This is meant as a reference guide and so I've tried to avoid extensive explanations. This isn't so much an Instructable as it is an Informable. My objective here is to give you all the information that you might need in order to hack an ATX PSU to meet your needs. We like to improve on what already exists and fit the product to our needs. My observation is that most makers, hackers, and mad scientists don't follow instructions very well. Igor's Lab looks at the capabilities of each 12VHPWR pin closely, with a discussion about the pin-out diagram of the H+ connector.There are tons of Instructables on how to hack a discarded ATX (computer) power supply unit (PSU) into a lab bench power supply. Cable quality is probably going to be mentioned prominently in PC PSU and accessory maker publicity materials, but I hope they don't make the headlines for the wrong reason. On the cabling side of things, the spec requires higher quality cables to be used (as they will be carrying more power in less area) to prevent issues at this point of the design. These four contacts are to carry sideband signals, but we don't know exactly what purposes they will be used for. Looking more closely at Igor's diagram, you can see a series of four contacts below the 12 pins of the main plug. This new socket can deliver 55A of continuous current at 12V, for a theoretical max power delivery of 660W (600W plus 10 per cent redundancy). ![]() In summary, the 12VHPWR has 12 pins, each fitting into a 3mm square spacing (8-pin Molex spacing is 4.2mm) in two rows, for a 18.85mm wide connector, which is just a tad wider than the old Molex 8-pin one. Some PC component suppliers have already started listing 12VHPWR / H+ plugs and cables and from these sources Igor's Lab has put together a diagram, explaining various features of the connector. The new 12VHPWR can deliver much greater power, is more future-proof, and is likely to be widely adopted as backed by the PCI-SIG, which also refers to it as the 'High Power Connector (H+)'. ![]() In August last year we first saw Nvidia's own design solution to this problem, a compact new 12-pin power connector (19mm), to replace the typical two 8-pin connectors on high-end boards, and which became standard fare on Founders Edition GPUs, if not many PSUs. Called 12VHPWR, the new connector can deliver up to 600W via 12 pins, a power draw which would normally require a graphics card to be fitted with four 8-pin Molex power connectors. A new high density power connector designed as part of the PCIe 5.0 standard, and rumoured to be present on the Nvidia GeForce RTX 3090 Ti, has come to light.
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