Looking for old PSU in CT

D.B.Cooper

D.B.Cooper

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Need to find a usable PSU of around 350W or so with a -5V rail and of course a 20 pin mobo connector. Any ideas where I could get something like that, aside from classifieds?
 
Why wont a normal PSU work for you? Its not like your looking for an AT-Style one. I use to work in a PC store (sales & techie) and this is why I'm confused.

EDIT: Excuse my ignorance on PSU (its a dark field that very few know what really goes on), but a PSU only has 12Volt rails (single or multiple)
 
Last edited:
cbrunsdonza said:
Why wont a normal PSU work for you? Its not like your looking for an AT-Style one. I use to work in a PC store (sales & techie) and this is why I'm confused.
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Because I have an old mobo I'm using as a download server and it requires a -5V rail to draw power from. Modern psu's don't have -5V rails. As for classifieds, in all likelihood I'd be getting something that was almost dead already. I'd like something that's still in good nick with a few years service left in it.
 
Modern psu's do have -5v rails.... don't they? I get -5v readings on my voltages.
 
D.B.Cooper said:
Because I have an old mobo I'm using as a download server and it requires a -5V rail to draw power from. Modern psu's don't have -5V rails. As for classifieds, in all likelihood I'd be getting something that was almost dead already. I'd like something that's still in good nick with a few years service left in it.
Click to expand...

Your going to struggle. Your better off sourcing an old PC else your need to try Bridgeport - 5yrs ago I had to source an old PSU and we got from them (2nd hand as no new ones where available).
 
cbrunsdonza said:
Why wont a normal PSU work for you? Its not like your looking for an AT-Style one. I use to work in a PC store (sales & techie) and this is why I'm confused.

EDIT: Excuse my ignorance on PSU (its a dark field that very few know what really goes on), but a PSU only has 12Volt rails (single or multiple)
Click to expand...

If it only has 12V rails, why does the spec: http://www.formfactors.org/developer%5Cspecs%5Catx2_2.pdf mention 5V rails? Unless I'm reading it wrong. Also here: http://en.wikipedia.org/wiki/ATX

"Systems that use an ISA bus require ATX/ATX12V 1.2 or earlier because the ISA bus requires a −5 V power rail unless the board provides a DC to DC converter that supplies −5 V. ATX/ATX12V 1.3 and later prohibit the −5 V rail so power supplies built to these versions are usually unsuitable for ISA systems."
 
Thanks for the correction

I was going to ask our embedded developer on this next week (not in today) as he is an electrical engineer. Those links have now cleared it up for me. All the articles I was reading where refering to only the 12V rail ( I see this is because newer systems draw most power from the 12V).

The Wiki article gives a great breakdown of the PSU evolution.
 
cbrunsdonza said:
Thanks for the correction

I was going to ask our embedded developer on this next week (not in today) as he is an electrical engineer. Those links have now cleared it up for me. All the articles I was reading where refering to only the 12V rail ( I see this is because newer systems draw most power from the 12V).

The Wiki article gives a great breakdown of the PSU evolution.
Click to expand...

Yup, that is why modern psu's are no good to me. Oh well, looks like I'm going to have to shell out for a new server. :cry:
 
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