Connecting AT Power Supplies to ATX Motherboards?

Posted by Cliff on Monday June 4, 2001 @06:38AM from the can-it-be-done dept.

Cam Wray asks: "Recently I have upgraded an old AT Server Box, Plenty of Space. It has two power supplies in it. However they are both AT power supplies and the Motherboard is an ATX. What I was wondering is there anyone to convert the AT plugs with an adaptor, or wired etc, to fit an ATX plug. I do not need the Poewer Management side of the ATX as the Computer will be a Backup Server. Any help would be grateful." With AT power supplies on their way out, this information might proove useful for people looking to keep their AT systems up for a little while longer.

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Not easily possible. by tzanger · 2001-06-04 02:47 · Score: 5

AT and ATX power supplies give you +/-5V and +/-12V. That's where the similarity ends.

ATX power supplies also give a +3.3V an always-on 5V (I think) and have the soft power switch (ground the green wire to toggle on and off). While it's easy to rewire the power switch, that 3.3V is gonna be tricky unless you know what you're doing. We're not talking about throwing on a cheap-ass LM2983 and a couple caps. A 250W ATX supply has a 14A rated 3.3V supply.

Nice idea but not really worth trying.