ATX power supply, What size?

[Reflex]

Not really. I ran 6 3.5" HDDs, ZIP-100 drive and a CD-RW with a 300W PSU.

it's quite the same than mine.
But what about Zorro3 and PCI Card?
CSPPC?

I think that the PPC, being a dual CPU board, is very power hungry

[mechy]

it's quite the same than mine.
But what about Zorro3 and PCI Card?
CSPPC?

I think that the PPC, being a dual CPU board, is very power hungry

Zorro3 and pci aren't a problem. For many years i ran a 4000 with stock  150w psu with csppc and full of zorro cards(picasso IV,Fastlane  Z3,ethernet card,Vlab and a few hd's and a extra fan or 2 inside,and it  never missed a beat and ran 24/7.

The 604e ppc is trivial compared to say a G5 cpu and the 060 being 3.3v is not a power pig(usually less than most 040's if memory serves)... Its just not that bad power wise. you have to realize most of the large psu's are coming out for machines running the graphics cards with Uber powerfull or multiple GPU's or servers with many drives. The amiga is a trivial load compared to this stuff...I just don't see the need for more than a 400W psu in the worst case.

this is my last reply,hard to believe this has gone on this long. This isn't rocket science
I dont know what you are using to "simulate" your power requirements,but it sounds way off.

Mech

[Xanxi]

I'm interested in reading this thread further. I hope i will learn something useful to solve my own problem with my A4000. This one has 3 zorro boards (including Cyb64 3D, Deneb and A2386) and 3 ISA boards to use with the A2386, only one 3,5' HD, 2 floppy, and an USB internal bay, plus an indivision. Problem is the A2386 is sometimes working sometimes not, though always detected by sysinfo or sysspeed. It works perfectly when the configuration is more basic with less cards. I use a 200W ATX PSU modified by Cosmos to be A4000 friendly. I also have a genuine A4000 PSU: if i use it, the A2386 never boots properly.
It looks to me as a power problem (+5V or +12V, who knows?).
So i am puzzled when i read Piru is using 6 HD, etc with a small PSU.
I am definitly interested by a powerful A4000 PSU ready to be installed in the case.
Mechy, i'm counting on you, make us an A4000 APower :-)

[mechy]

I'm interested in reading this thread further. I hope i will learn something useful to solve my own problem with my A4000. This one has 3 zorro boards (including Cyb64 3D, Deneb and A2386) and 3 ISA boards to use with the A2386, only one 3,5' HD, 2 floppy, and an USB internal bay, plus an indivision. Problem is the A2386 is sometimes working sometimes not, though always detected by sysinfo or sysspeed. It works perfectly when the configuration is more basic with less cards. I use a 200W ATX PSU modified by Cosmos to be A4000 friendly. I also have a genuine A4000 PSU: if i use it, the A2386 never boots properly.
It looks to me as a power problem (+5V or +12V, who knows?).
So i am puzzled when i read Piru is using 6 HD, etc with a small PSU.
I am definitly interested by a powerful A4000 PSU ready to be installed in the case.
Mechy, i'm counting on you, make us an A4000 APower :-)

HAHA i think my power supply fun is over its too much work.
seriously though dont be puzzled by the psu delima.. thats why i said the overall watts rating does not mean much. look at the break down of the psu power rails for +5,+12 etc etc.. for example,the power supply i use is rated 20 amps on +5. sounds great,BUT in real life you will not get to use all 20 amps. In some PSU's the rail is shared with other voltages like +3.3 . so if you had 3.3v stuff in use you would only get a percentage of that +5v rails 20 amps.the amiga of course in most cases doesn't use the 3.3v(except some mediator radeon hacks) and this is not a issue. but you will find some big psu's have poor +5 ratings,this is why you cant go by big wattage ratings alone. theres many other factors. cheap psu's with bad filtering can cause crashes and havoc.some chinese supplies i've seen have horrible,dirty power output.

a side note,alot of friends recommend ANTEC,and i just picked up a new 380W ANTEC EARTHWATTS that came in(rated 20A on +5) and guess what,its crap. +5 is reading 4.83v on the +5 rail with it hooked up and the 4000 on,its just low enough where the machine won't boot reliably. ahem..time to go buy another. its been my experience amigas aren't happy with much less than 4.92V on the +5.
so i say go by the amps on +5 and +12,and hope you bought a decent brand..

hope all my long winded typing helps someone out there

mech

[Zac67]

250W will be fine (actuallly 200W will do).

I'm running an Athlon II 635 (2,9 GHz QC), 3 GB RAM, 250 GB, 500 GB & 1000 GB HDDs 7k RPMs, BD R/W, GeForce GTS 450 (which I'm running full load with F@H) with  - 340W. Would've tried a 300W but couldn't find a decent one.

Just add up your loads, add 10% for safety (or 20%) and that's it. On heavier 5V loads you'll need to watch that rail specifically. And you'll want to get a quality PSU before you risk a cheap one burning your precious hardware to a crisp.
And with the probably rather fair load an 80+ PSU will save some energy when running long hours.