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Can I get a quick electrical lesson.

post #1 of 59
Thread Starter 
So I screwed up... it happens. I had thought these two PSUs were basically the same except for the $20 due to the similarity across the rails.

BP550: +3.3V@28A,+5V@26A,+12V1@22A,+12V2@22A, +12V3@25A,-12V@0.5A,+5VSB@2.5A
EA650: +3.3V@25A,+5V@25A,+12V1@22A,+12V2@22A, +12V3@25A,-12V@0.5A,+5VSB@2.5A

There not.

BP550: Max Load V1, V2, V3 384w Max W: 534w
EA650: Max Load V1, V2, V3 534w Max W: 631w


Can anyone explain to be why their outputs are so different even though they seem to start off more or less the same. Or are they just under-rating the BP? How can you tell which one a company is doing at any given time?
Edited by thegreatsquare - 12/13/09 at 4:37pm
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post #2 of 59
Um, one is 550watts and other is 650watts. The 650watts can give off more power? I dont really know what you measn?
    
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post #3 of 59
Quote:
Originally Posted by bbaseballboy1234 View Post
Um, one is 550watts and other is 650watts. The 650watts can give off more power? I dont really know what you measn?
He's asking for an explanation as to why.
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post #4 of 59
He wants to see know why one supplies more power. Since they almost have the same exact specs, just ones a 650 and the other is a 500
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post #5 of 59
+3.3V@28A,+5V@26A

+3.3V@25A,+5V@25A

To calculate wattage, multiply the voltage by the amps

the top one should give mroe wattage
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post #6 of 59
Quote:
Originally Posted by dieanotherday View Post
+3.3V@28A,+5V@26A

+3.3V@25A,+5V@25A

To calculate wattage, multiply the voltage by the amps

the top one should give mroe wattage
Yeah, but why does the 650W Earthwatts have 540W on the +12V while the Basic only has 384W even though all three of those +12V specifications are the same?
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post #7 of 59
the top first one will five you more wattage output than the second as it has higher total amperage. im guessing that the wattage number on the second one are just inflated. but the combined amps on all three 12v rails are 69 amps which is actually 828watts so i'm not sure exactly how they are coming up with their numbers.
Edited by CSU_ComputerMajor - 12/13/09 at 5:25pm
    
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post #8 of 59
Quote:
Originally Posted by CSU_ComputerMajor View Post
the top first one will five you more wattage output than the second as it has higher total amperage. im guessing that the wattage number on the second one are just inflated.
But it's not. The Earthwatts series is certainly a superior PSU to the Basiq.
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post #9 of 59
Quote:
Originally Posted by dieanotherday View Post
+3.3V@28A,+5V@26A

+3.3V@25A,+5V@25A

To calculate wattage, multiply the voltage by the amps

the top one should give mroe wattage
The problem is that the difference between those two numbers is only 14.9W, not a whole 100W.


The real difference is that the rails are only rails because they have unique OCP circuit (over current protection). The numbers you are reading are the max current each rail can provide before that circuit trips. What it doesn't tell you is how much power output the rails can handle combined because they all come from the same power source (same bridge rectifier and what not).

For example, these PSUs say 3 12V rails at 22A each. That gives 264W per rail, or 792W total. That's a lot more than you can actually get out of the PSU. The real rating is probably something like 396W on all the 12V rails combined (33A), but you're limited to drawing 22A out of that from a single rail.
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post #10 of 59
i think i get it -they both have identical amperage on the three 12v rails, yet the 650 can somehow output more watts. I'd say that's either false information, or the 650 has better load balancing and can output more amps from each rail simultaneously. Something not very well known is that with multiple 12v rails, the rated amperage on each rail cannot be used simultaneously if the other rails are also in use.
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