how do I know the diference between at and atx power supply?

December 9, 2011 at 02:48:02
Specs: Windows 64
how do I know the diference between at and atx power supply?

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#1
December 9, 2011 at 03:19:15
http://wiki.answers.com/Q/What_are_...

"Channeling the spirit of jboy..."


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#2
December 9, 2011 at 14:53:45
Probably the easiest way to tell are by the main power plugs that connect to the motherboard. An AT power supply has this: http://lib.store.yahoo.net/lib/dire... plus it's hard wired directly to the switch in the front of the case.

An ATX power supply has either a 20-pin or 24-pin main plug that looks like this: http://www.homeserverland.com/legac... & it's powered on by the the case switch which is connected directly to the motherboard, not to the power supply.


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#3
December 9, 2011 at 16:11:04
The big difference is that with an ATX power supply, mains current never leaves the power supply. All wires coming out of the power supply carry 12v at the most thus reducing the chances of an electric shock.

With an AT power supply there are four thick wires coming out of the power supply carrying mains current the connected to the front panel switch. Any computer with an AT power supply is going to be at least ten years old and probably a lot older.

That is why with AT powered computers you always got the message, "It is now safe to turn of your computer." once the shut down procedure had completed.

With ATX power supplies the mains power is turned off electronically with just a small residual current going to the motherboard in order to turn back on again.,

Stuart


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