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Old ATX PSU connectors question

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First post, by dicky96

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Hi guys
I have a QDI PlatiniX2 motherboard (socket 478)

I've got it working now, just needed a few leaking caps changing on the Vcore rail, but it still wouldn't boot, which turned out to be because the old ATX PSU was faulty - it would power up and immediately shut down again, then not power up again unless the 220V was disconnected for some seconds.

Anyway I used a good known working 20 pin ATX and the motherboard now POSTs

The question is, the motherboard and old PSU have this extra connector next to the ATX connector - it looks like one half of an AT PSU connector. The good working PSU didn't have that connector but the motherboard POSTs anyway so it doesn't seem to be anything important.

What is the extra connector for?

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Reply 1 of 4, by Miphee

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"The aux power cable was added to provide extra wattage to motherboards for 3.3 and 5 volts. This connector is rarely used anymore. It's most commonly found on older dual CPU AMD motherboards. You're more likely to sight Bigfoot than a motherboard which uses this connector. It plugs into the 6 pin version of the motherboard connector used by the original PC main power cables."
http://www.playtool.com/pages/psuconnectors/c … ectors.html#aux

Reply 2 of 4, by bjwil1991

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Didn't some video cards require that as well, like the FirePro ATI cards, for example, or was that incorrect information? I have a Pentium 4 board that has that style connection, which I've never seen before a day in my life.

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Reply 3 of 4, by dicky96

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Miphee wrote:

"The aux power cable was added to provide extra wattage to motherboards for 3.3 and 5 volts. This connector is rarely used anymore. It's most commonly found on older dual CPU AMD motherboards. You're more likely to sight Bigfoot than a motherboard which uses this connector. It plugs into the 6 pin version of the motherboard connector used by the original PC main power cables."
http://www.playtool.com/pages/psuconnectors/c … ectors.html#aux

But I do have motherboard that uses this connector - see the pics I posted QDI Legend PlatiniX 2

But it works without as I said

Regards Bigfoot - is that the Quantum HDD you are referring too? Nope not seen one of those beasts in over 20 years 🤣

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