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How to calculate wattage on 12v rail? - Page 2

post #11 of 14
The total wattage is not there for a reason. As Phaedrus and others have said, the manufacturer is trying to get around actually telling you what the total wattage is. In this way, if anyone does actually question them on the wattage, they can make up some BS equation on how they got it.
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post #12 of 14
Thread Starter 
So would you say in a 'perfect' situation, you COULD do that equation, but the lesser the quality of the PSU's, the less the wattage relates to the amps on the 12v rails?

i mean there is obviously a relationship - higher quality PSU's have a larger amount of amps and watts on their 12v rails than crappy ones. Maybe the equation I mentioned isn't exactly correct, but it does seem to have a correlation to the 12v rail power.
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post #13 of 14
Older and crappier PSU's have higher amps on the 5v + and 3.3v +, which older computers used (like 10 years ago). This is the ATX 1.x standard. Starting with the ATX 2.x standard, more power is required on the 12v+, and less on the 3.3 and 5 v + (as well as other changes). Some cheap PSU makers will label their PSU as 2.x, but still use the older 1.x internals. So while the PSU may be a 350w PSU, it has the power on the wrong voltage for current systems, and can even be harmful to newer systems.
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post #14 of 14
Quote:
Originally Posted by Belial View Post
So would you say in a 'perfect' situation, you COULD do that equation, but the lesser the quality of the PSU's, the less the wattage relates to the amps on the 12v rails?

i mean there is obviously a relationship - higher quality PSU's have a larger amount of amps and watts on their 12v rails than crappy ones. Maybe the equation I mentioned isn't exactly correct, but it does seem to have a correlation to the 12v rail power.
No -- in a perfect situation, the sticker on the PSU will clearly state what its output capability at +12V is, leaving no room for doubt or forcing you to do math to figure out what your PSU can or cannot do. You should never add up the amperage ratings for several +12V rails. While the result may sometimes match the PSU's actual capabilities, in most cases it won't, and just because it sometimes does does not mean anything Look at the Antec TP-750 for example. It has four +12V rails, each rated for 25A. Obviously you can't add those up for a total of 100A, or you'd have a 1200W PSU. The ampere ratings on the sticker tell you how the OCP is calibrated on each rail, not how much total power you can get out of the PSU.

And none of this really has anything to do with quality, except as applied to the trustworthiness of the sticker. If the sticker somehow omits the "total wattage" information, then something's up. If the sticker does have the info, then it depends on the brand whether you can trust the sticker or not
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