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| What current can really delivery an atx 400w pc psu? |
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| Chriss:
Hi! I'm doing some reading on the net about atx psu. They write does an atx 400W psu can delivery only 23A on the 12v rail. Somehow I don't understand. What about the rest of the power? I=P/I so that mean 400/12=33.33A. So, how they come to 23A and so? Actually now I'm cuourious how much A can really delivery constantly the 12v rail on such of psu? |
| KaneTW:
Good ATX PSUs list max currents per rail. Example: https://seasonic.com/pub/media/pdf/consumer/datasheet/PRIME-ULTRA-Titanium-TR.pdf The rest goes onto the other (3.3/5/-12) rails. |
| RoGeorge:
The max power rating is usually for al outputs loaded at the same time, not only the +12V rail(s), but also -12V, +5V, +3.3V as well. |
| Chriss:
Thanks for the quick replay. I already checked the doc you shared. I'm a bit confused. Is it really true does lets say the Prime 1000 psu from that list can delivery 83A? If yes, hiw long can it delivery without to fail? Can that psu delivery lets say for 10h 50A without really to fail? |
| aheid:
Seasonic is usually good stuff, as long as the unit has proper ventilation I would expect it to handle 80A for days (assuming minimal load on the other rails). Note that in most high end ATX PSU's the other rails are derived from the +12V rail, hence the ability to deliver all the power there. |
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