Power Supply and case [Archive]

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jpeppers

11-17-1999, 11:23 PM

I was wondering can I change out a power supply from an AT to an ATX power supply. I just bought a case and speakers combo and just realized it was an AT power supply. Now, I have the exact same case but I have an ATX power supply in mine. I guess my question is would it have an effect on the power button being a soft off - on switch (ATX), opposed to the flipping the switch (AT). If this sounds stupid, I'm kinda of new to doing things like this!

JW310

11-17-1999, 11:51 PM

Not possible to switch from AT to ATX or vice-versa, unless your motherboard supports both AT and ATX motherboards (do any of them? I'm not sure). ATX power supplies switch the computer on and off through the motherboard, while ATs switch on and off through the P.S.

JW

jpeppers

11-18-1999, 10:06 AM

I haven't purchased the motherboard yet, I was wanting to make this change so I can get a ATX motherboard. Will this be possible before I make a decision on a motherboard?

Donkey

11-18-1999, 10:25 AM

Yes you can change the power supply but you will also need to change the on off button to something that is not continuously on,when turned on as in the AT.

jbob

11-18-1999, 01:41 PM

Go to www.pcchips.com (http://www.pcchips.com) they have several boards that allow either AT, or ATX power supplies, ie M748LMRT, M726, M747....

We have several of these boards in the field, no problems so far.

As far as putting an ATX board into an AT case, we use the reset switch for the power switch, since the power switch is not on the ATX power supply.

[This message has been edited by jbob (edited 11-18-1999).]

DrW

11-19-1999, 12:56 AM

For the record I know of at least one board that can handle an AT or ATX power supply, BUT you have to jumper it to one or the other, so it would do you no good. I installed a Shuttle-Hot 579 board (http://www.spacewalker.com/english/579.gif) this summer in a bare-bones system, and noting from the link, you can see both the pluggins for an AT or ATX p/s. This is just a note that if you come across other boards with this feature, be warned that you will either have to jumper the mobo to AT or ATX, thus eliminating any good the board might do you.

Regards,
DrW