![]() In this case, you may try using an IDE to SATA adapter, which attaches to one of 4-pin peripheral connectors and converts it into SATA connector with missing 3.3V rail. These adapters actually make things worse because they add extra resistance between PSU and the load causing more voltage drop.Īnother issue to keep in mind is PSUs built prior to 2003 may not have a serial ATA cable. Note that 20-to-24 pin adapter cables are totally useless since all the currents are still passing through a 20-pin power supply connector. More specifically, if a motherboard requires either 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. You may use various online PC wattage calculators to estimate your requirements.Ģ4/20-pin power supply pinout (front view). ![]() Such v2.0 models are sometimes called ATX-II. 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. 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. A simple math shows that with 20-pin main and 4-pin 12V2 aux connectors your maximum power could be 355 watt. The 4-pin 12V2 connector P4 is rated 8A/pin, so you can additionally draw up to 16A on +12V. Since the Molex power connector is rated at 6 amps per circuit, with 20-pin part you should not draw more than 12A from 3.3V, 24A from +5V and 6A from +12V (note that pin 11 is often used for 3.3V remote sense). If you exceed current rating of a connector, it may overheat and even melt. There was obviously a good reason to add extra four wires to the main cable- it was done to support higher current requirements. However, power supply compatibility is not merely a mechanical issue. ![]() Nevertheless, double check that pin 1 goes into pin 1. The power connector is polarized, so it's difficult to insert it wrong into the header unless you force it really hard. The four pins that you are leaving open are just redundant lines for higher current capability (see this guide to ATX connectors and pinouts). Technically, a 20-pin ATX connector can be plugged straight into a 24-pin motherboard socket, leaving male pins 11, 12, 23, and 24 unconnected. 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.ĬONNECTING A 20-PIN PSU TO A 24-PIN BOARD. Just note that this guide applies only to standard ATX models based on Intel's guidelines. ![]()
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