Well done and nice touches with the fan header and resistor.

Just in case, after tinkering with a PSU always first test it outside of comp, with paper clip and a couple old fans attached for load. This will minimize collateral damage if something goes kaboom.

thanks!

the resistor was needed unfortunately, the "silent" fans were only silent in paper... don't know how much the fan will hold until it groans but for now it'll do 😀
I already did the fan test before powering on a mobo , you can never be sure enough 🤣 🤣 🤣

Just curious, what fan did you end up using? I've thought of sourcing old 5V-heavy power supplies, replacing their capacitors and possibly their fans too. You frequently see people buying ADDA, Delta or SUNON fans on other forums. Is such an extreme measure necessary?

just get one of those 80mm deltas that pushes 200CFM at 80dba and do it like a boss

There are people who fit a Noctua NF-F12 inside a CX430, but IMHO for retrocomps up to PIII systems, that probably will never draw even 100W DC and will only see occasional use, any quiet, unexpensive fresh fan will be enough to handle the little heat generated inside the PSU at such lower draws. (Provided there is decent case ventilation and we don't burden the poor PSU fan with full responsability for cooling the entire PC, that is).

BTW Keropi, in case your wall sockets are of the Schuko type:

Perhaps we should comment about reversed polarity ...

@Evert
it's nothing special, just a rebranded fan from a local "computer super-store" ... no idea what the maker is but it's not that great... I got it because it said in the box it was "silent" , total bs. It will be replaced with some branded one once it starts making noise.

@TELVM
I use a 22eur noctua fan in my PS1/pro's psu 😁 overkill but the machine worths it for all the joy it offered me in the early 90s...

My wall shockets are schuko as you guessed, please share your thoughts on the subject!

By chance we're just talking about polarization and Schukos at jonnyGURU: http://www.jonnyguru.com/forums/showthread.ph … 7558e02&t=12385

my apartment is and old one in the center of the city, I am pretty sure that the sockets - schuko or not - are connected randomly... 🤣

Being in Greece most probably CEE 7/3 Schukos with random polarization.

The Danish socket looks so happy!

I want to use this old AOpen PSU with a Pentium 3 system as it has a 120mm fan that will help with the cooling of a otherwise poorly ventilated case.

The spec.

The inside.

The suspect. This blue cap looks a bit suspicious, not leaking but slightly bulged. Does anyone know what this cap is supposed to do?

Just grabbed two of those:

Never saw a cramped PSU like this one before.

It came with a funny connector (yes, it has the same keying of a PCI-e 6pin):

Never say a mobo that required 3.3V + 12V AUX on this modern connector, just the AT-style one.

Some caps seems Chemicons, others are Panasonic. Don't know what the main one is, though.

Any thoughts?

Skyscraper wrote:

... This blue cap looks a bit suspicious, not leaking but slightly bulged. Does anyone know what this cap is supposed to do? ...

Can't see much but that light blue Teapo cap is close to the +5VSB wire (purple), it might be for +5VSB output filtering. And it's clearly bulging up.

Snayperskaya wrote:

Any thoughts?

Looks cramped because of the huge, thick, efficient heatsinks. Again can't see much but from a distance it screams quality, as the jap caps confirm.

Found a review, it's an excellent +5V super-heavy PSU originally designed for servers, ideal for powerful +5V heavy retrocomps.

Never say a mobo that required 3.3V + 12V AUX on this modern connector, just the AT-style one.

I think that's one of the rare and weird '6-pin EPS connectors'.

My bet is that those two were pulled from servers. Also got two hp2-6400p (the 400W version of this) a month ago. Put one of the 400W ones on a modern, low-power system (AII X4) for my parents. Got them for ~17 USD the 400W apiece and ~27 USD the 500W ones. Pretty good value for server parts (that usually last forever).

TELVM wrote:

Skyscraper wrote:

... This blue cap looks a bit suspicious, not leaking but slightly bulged. Does anyone know what this cap is supposed to do? ...

Can't see much but that light blue Teapo cap is close to the +5VSB wire (purple), it might be for +5VSB output filtering. And it's clearly bulging up.

The +5VSB rail seems to perform OK, the only rail that is out of spec is the -12V rail, it hovers around -11.5V and I had to turn of the CUSL2-Cs monitoring of this rail or it would nag.

I tested the PSU with a P3 1400@1575 and a Geforce 6800GT and it at least worked. All other caps in the PSU look good and all important rails perform fine if my DMM is reading things right. This system wont see much use so I think it can live with this PSU for now.

Using a psu with bulging caps is a terrible idea!

wave wrote:

Using a psu with bulging caps is a terrible idea!

Not only using, Im pushing a Tualatin 1400-S @1680MHz through some benchmarks with a Geforce 6800GT 😉

This system probably wont get used at all beyond these benchmarks as I have another CUSL2 system also with a Tualatin 1400-S that I do use. I just wanted to run some benchmarks in XP while testing out the new spare hardware I bought. Systems I use frequently have better PSUs... at least most of them...

wave wrote:

Using a psu with bulging caps is a terrible idea!

Skyscrapper just likes living dangerously and he doesn't give a fuck about sissy stuff like bulging caps or case ventilation. 🤣

Skål! 😀

To make member wave sleep better at night here is a pic of the inside of the very similar AOpen 300W PSU I do use with my P3 Windows 98 system 😁. The inside of this PSU looks exactly like the 350W version above and the rails max amps are the same only maxium load and max combined load on 3.3V + 5V differs. Well the blue cap also looks a bit different.

What do we think about this old Chieftec PSU? It dosnt have any bulging or leaking caps.

TELVM wrote:

wave wrote:

Using a psu with bulging caps is a terrible idea!

Skyscrapper just likes living dangerously and he doesn't give a fuck about sissy stuff like bulging caps or case ventilation. 🤣

Skål! 😀

Skål!

GPS-400AA

That's a Delta 😀 😀 😀 😀 😀 😎 😎 😎 😁

Delta is in the top 5 of best power supply manufacturers. Definitely worth recapping and keeping!