12.09.2014

Power supply atx12v connector

Now you can use this adapter cable to make your existing standard ATX power supply work with a Pentium 4 motherboard.
Constantly changing computer specifications often cause power supply compatibility issues when you do a replacement or an upgrade.
Technically, a 20-pin ATX connector can be plugged straight into a 24-pin motherboard socket, leaving pins 11, 12, 23, and 24 unconnected.
More specifically, if a motherboard requires 3.3V current that exceeds 12 A or +5V current over 24 A, and it does not have an aux 6-pin connector, you should use a 24-pin PSU.
If you use high-end graphics card with an additional 6-pin or 8-pin power header, you may try to use an adapter that converts two 4-pin peripheral cables into a 6-pin PCI Express cable. The only potential problem with using a new PSU with an old computer is today's PSUs usually do not provide minus 5V output (they either don't have the white wire going to pin 20 at all, or they leave it not connected inside). Note: The information in this site is provided AS IS and does not constitute a professional advice. Newegg.ca - A great place to buy computers, computer parts, electronics, software, accessories, and DVDs online. If you are reading this message, Please click this link to reload this page.(Do not use your browser's "Refresh" button). If you see this message, your web browser doesn't support JavaScript or JavaScript is disabled.
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For such an application, the PSU typically has to be >400W, or otherwise you may not have enough current rating on 12 volt output. It has the last four pins on a detachable section that slips out, so you can plug it into an older motherboard (see the diagram above). Even some of ATX-I PSUs may not have "-5V", which was made optional in ATX12V version 1.2 spec as of 2002. With great prices, fast shipping, and top-rated customer service - once you know, you Newegg.
The power connector is polarized, so it's difficult to insert it wrong into the header unless you force it really hard. These adapters actually make things worse because they add extra resistance between PSU and the load causing more voltage drop. Just don't plug the remaining 4-pin piece anywhere- it is not compatible with any other circuits!


A simple math shows that with 20-pin main and 4-pin 12V2 aux connectors your maximum power could be 355 watt. If your PSU happens to have a solid 24-pin connector, you can still try to insert it into 20-pin slot with the last four pins hanging over the edge of the board's connector. It does not apply to some branded cases (such as Power Mac's, HP and Dell), which use different non-standard wiring and may require an exactly-matching PSU. There was obviously a good reason to add extra four wires to the main cable-- it was done to support higher current requirements.
However, even if your system needs overall less than 355 watt, you still need to know the distribution of the currents on the motherboard and verify that you can get required amperage from each rail of your power supply. Then it should be asserted TTL logic high by the power supply within 100 to 500 ms after +12 VDC, +5 VDC, and +3.3 VDC outputs reach their regulation bands. In this case, if you can't find a power supply with such a rail, you can derive it from -12V by adding a negative linear regulator such as MC79M05.
If your system needs more amps on any individual rail and the motherboard does not have an auxiliary 6-pin power connector (which has been removed from ATX 2.0 spec in 2003), you would be better off going with an ATX12V version 2 compliant power supply with 24-pin connector, even if your old PSU has sufficient overall power rating.
Conversely, it has to switch to TTL low state when any of positive DC voltages falls below its under voltage threshold, or at least 16 ms after input power has been removed. This may be too much for a stand alone device, so may you need to attach it to a little heatsink. Modern systems may have booting problems and may not work without properly functioning PWR_OK signal.



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