Archived from groups: alt.comp.hardware.pc-homebuilt (
More info?)
ric wrote:
> David Maynard wrote:
>
>
>>>>Are there atx PSUs that fit neatly in AT boxes ? ISTR that the AT
>>>>power supplies were huge by today's standards.
>>>
>>>
>>>There were *many* physical sizes of PSUs that worked with the AT
>>>*electrical* specification. "Slim" size PSUs, quite popular during
>>>the latter stage of the AT era, are identical in size and hole layout
>>>to ATX type PSUs. Many AT cases accepted this size PSU. These cases
>>>will also accept ATX PSUs.
>>
>>True, except that they mount in reverse of each other (fan outlet--power
>>entry reverse rear position), meaning the ATX supply will be 'upside down'
>>in an AT case. That's not really a problem unless you're counting on the
>>'second fan' in a dual fan PSU for anything.
>
>
> If, as planned, he is using it to power an AT motherboard, the CPU will
> not be directly below the PSU (as it is on an ATX board), so the fan will
> be case air circulating only. As such, the top location may even be better.
Regardless of where the CPU is located on the motherboard I don't see how
you come to the conclusion that having the 'second' fan on the opposite
side from the motherboard is 'better', especially since that could mean
it's jammed packed, smack up against the case wall, depending on the case,
but, regardless, all I did was point it out. If you think that's wonderful
then so be it.
>>The power switch has to be
>>changed too as the AT switch is an AC alternate action/toggle type whereas
>>the ATX is a momentary action connected to the mobo.
>
>
> Again, he is trying to power an AT motherboard with an ATX PSU. The ON/OFF
> problem is addressed in the PSU/MB connector adapter. See:
>
>
http://www.pcpowercooling.com/products/cooling/accessories/popups/indexatxtoatcable.htm
Great. All I said was it needs to be changed and that's one way to begin
the change.
>>The bigger problem is the motherboard.
>
>
> But since we're discussing the PSU, this is irrelevant. [Besides, he
> planned on putting an AT motherboard in an AT case.] Read the OP.
Since he was planning to put an AT motherboard in an AT case with an AT
power supply I haven't figured out why anyone is trying to get him to
change it to an ATX PSU to begin with. But since folks seem all fired set
on cramming ATX components into his AT case I thought I'd mention, as an
FYI, the problems of trying to do that with an ATX motherboard.