ATX PSU for cyberstormppc/mediator4000DI

[amiga4001]

Well I purchased several psu to try to boot my amiga(A4000cyberstorm(604/233-060/50) mediator busboard with voodoo5 spider fastethernetcard and isdn surfer with delfina attached.
All psu's I tried did boot up nicely indeed but when the amiga had been working for some time it just won't boot anymore.
Now I have purchased me a 460W ATX and modified it so it has a amiga powerplug now placed several wires(thick ones) for all voltages and ground.
Same problem!
Only psu which does the job is the original psu of 145W.
I now use this one and an other atx one to power my drives.
Not ideal.
Anybody got a working setup like this one with ATX PSU?
Does the original psu produces a higher peak at start or something?

[amiga4001]

What is your processorcard?
As it only concerns the cyberstormppc as I also tried a cyberstormmk2 which workes just fine with the other psu's.
But I definately need an other psu as the original (while it only feeds the mobo/mediator) is on it's limits.
As soon as I ad one other thing(like buddha) the original screenmodes start to turn black after a few secs.
What is your model type brand psu you are using?

[amiga4001]

No it isn't in a desktop case it is in a tower.
And it really is powerrelated as as soon as it doesn't boot up no more with the modified atx psu I tried with the original right away and bingo booting.
Surely it has something to do with some kind of powerpeak at start which PC don't need to powerup.
Nobody with a cyberstormppc with an ATX psu?

[amiga4001]

That is also a very heavy setup.
You have no problems booting up (coldstart of course) when it has been turned on for a while?
Very strange this is as the system itself is very solid here.

[amiga4001]

Yes I did connect the (PW-OK grey wire) of atx to the powerconnector of the amiga.
Don,t know if it is number one on the powerconnector but when cold it boots nicely and with a "normal" processorcard all works well so wiring should be ok right?
Strange thing is I even tried it with only mobo and cyberstorm and nothing else same problem.
Can not be that there is enough current(460 W against 145W).
So has something to do with a kind of peak which the psu must deliver to start booting(just guessing here).
Maybe these problems onlt appear with the 604 on 233 MHZ?

[amiga4001]

Well actually I tried 3 PSUs one AT200W secondhand 3 euro one new ATX 250W 20 euro one ATX secondhand 460W 15 euro.
I don't care about spending a lot of money one a new psu but I got to be sure it works.
Is this sunsonic a good brand to purchase you think?
Any other recommandations?

[amiga4001]

ok thanks for your input.
Will look into a "better" psu.
Hope this one wil then be the latest psu I have to purchase.