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# Can this be right? - Page 2

Quote:
 Originally Posted by harryneopotter Well, as far as i know, "Multiplying the amps on +12V Rail to get the wattage" formula works only on a single +12V Rail PSU. In multiple +12v rail PSU's the amps given in specs only tell the "maximum amount of load a single rail can take, given that the total load on the remaining rails does not exceed the total 12V load limit of the PSU." In other words, if a 900 W PSU boasts of 4 +12V Rails each with 40Amp, it doesnt mean that all the four rails can take full load of 40 Amps on each of them simultaneously. Normally a 900 W PSU can take sumwhere around 800-860 W of load on the 12V rails, the rest being shared with 3.3V and 5 V rails ( use to power RAM sticks, HDDs and fan etc). The bloated looking amps on the individual 12V rails are provided so that you dont have to mix and match different rails to power a Power hungry PSU (as pointed out already by allikat). Otherwise, a normal 900W PSU with around 71-72 amps for 12V rails, will have 18Amps per rail if there are 4 of them. So if you are using a GPU which requires more than 18 Amps (which is 18*12= 216 W, a fairly normal number for High End GPU's these days) you have to power it using two different rails, which can be cumbersome for new users. I hope it^ made sense
It works on multi-rail power supplies too. Only a select few of the recommendable PSUs (like the 900W HCG) are a little off.

For a quick example:

All of the Antec TruePower New power supplies. Take the 750W unit: it's a multi-rail PSU that has a +12V capacity of 62A which comes out to be 744W. Now, 744W is the same +12V wattage capacity if many high-end single-rail 750W power supplies.
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So using these calculations, this would be a good psu since it can consistently supply 996 watts on the 12v rail while itself is only a 1000w psu (ie- it's max outputs are beefed up)?

http://www.kingwin.com/products/cate...es/mk_1000.asp
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Quote:
 Originally Posted by Steven-1979 So using these calculations, this would be a good psu since it can consistently supply 996 watts on the 12v rail while itself is only a 1000w psu (ie- it's max outputs are beefed up)? http://www.kingwin.com/products/cate...es/mk_1000.asp
I don't know how good or bad that specific unit is. It could be a junker for all I know.

For example: the 1100W ABS Majesty looks like it should be an awesome power supply. However, I have yet to find an even remotely good review on it.
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Quote:
 Originally Posted by TwoCables It works on multi-rail power supplies too. Only a select few of the recommendable PSUs (like the 900W HCG) are a little off. For a quick example: All of the Antec TruePower New power supplies. Take the 750W unit: it's a multi-rail PSU that has a +12V capacity of 62A which comes out to be 744W. Now, 744W is the same +12V wattage capacity if many high-end single-rail 750W power supplies.
Ohk, i was under the impression that all of the multi rail PSU have beefed up single 12V rail power. So yeah, if the facts you have given are right, then the formula works on this particular or similar PSU's as well.

Quote:
 Originally Posted by Steven-1979 So using these calculations, this would be a good psu since it can consistently supply 996 watts on the 12v rail while itself is only a 1000w psu (ie- it's max outputs are beefed up)? http://www.kingwin.com/products/cate...es/mk_1000.asp
Yea, it does look good. But keep it in mind that never put the PSU to its maximum 12W limit (i.e. 996 Watts) coz i dont think that the remaining 6W will be enough for HDD's/fans and other peripherals.

Also, you cant judge any PSU just by its specs. These specs dont have any value unless tested/reviwed/manufactured (in most cases) by some reputed person/organization/manufacturer.
Edited by harryneopotter - 8/5/11 at 4:43am
Quote:
 Originally Posted by harryneopotter Ohk, i was under the impression that all of the multi rail PSU have beefed up single 12V rail power. So yeah, if the facts you have given are right, then the formula works on this particular or similar PSU's as well. Yea, it does look good. But keep it in mind that never put the PSU to its maximum 12W limit (i.e. 996 Watts) coz i dont think that the remaining 6W will be enough for HDD's/fans and other peripherals. Also, you cant judge any PSU just by its specs. These specs dont have any value unless tested/reviwed/manufactured (in most cases) by some reputed person/organization/manufacturer.
If a PSU is rated to deliver a certain amount of power continuously (and if PSU gurus say that it's a good unit), then it's fine to make the PSU deliver that rated power continuously.

If PSU gurus don't recommend the PSU, then it can be a safe bet that the PSU's continuous rating is a bit of a lie for certain reasons, such as crapping out at 40-50Ã‚Â°C well before it begins delivering even 75% of its rated continuous delivery.

Although again: I know nothing about that specific Kingwin unit. I haven't seen anyone on here talk about it, so I am assuming that it's not a good unit. I mean take a look at the 1100 ABS Majesty again: it's an 1100W unit claiming 1100W of continous power with a +12V capacity of 996W. But the last I heard, it craps out at somewhere just over 800W, or 850 (or something bad like that - my memory is foggy on the finer details beyond that).

The only really reliable way to judge a PSU is to ask about it in this forum. Or, search the internet for professional reviews by sites like Jonnyguru.com.
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I see that the power supply says that it can continiously supply 1002w of power, not 996w. However, it'd make a great PSU for any system that would use 850w-900w. I would recommend something of higher quality if you think you'll be pushing it any further.
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Quote:
 Originally Posted by Jaguarbamf I see that the power supply says that it can continiously supply 1002w of power, not 996w. However, it'd make a great PSU for any system that would use 850w-900w. I would recommend something of higher quality if you think you'll be pushing it any further.
996W is just the +12V capacity.
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Quote:
 Originally Posted by TwoCables If a PSU is rated to deliver a certain amount of power continuously (and if PSU gurus say that it's a good unit), then it's fine to make the PSU deliver that rated power continuously. If PSU gurus don't recommend the PSU, then it can be a safe bet that the PSU's continuous rating is a bit of a lie for certain reasons, such as crapping out at 40-50Ã‚Â°C well before it begins delivering even 75% of its rated continuous delivery. Although again: I know nothing about that specific Kingwin unit. I haven't seen anyone on here talk about it, so I am assuming that it's not a good unit. I mean take a look at the 1100 ABS Majesty again: it's an 1100W unit claiming 1100W of continous power with a +12V capacity of 996W. But the last I heard, it craps out at somewhere just over 800W, or 850 (or something bad like that - my memory is foggy on the finer details beyond that). The only really reliable way to judge a PSU is to ask about it in this forum. Or, search the internet for professional reviews by sites like Jonnyguru.com.
Thats exactly what i meant to say...guess i screwed up
850watts peak on 12v as it says on jonnyguru. 850/12=70,8a peak/max. You can safely cut %10 for continuous value which is 63a

So it has 4 rails rated 40a. I don't think a rail would max out thou they are not supposed to feed lotsa things. However if a rail maxes out say @ 35a, the other rails have to make do with 63-35=28a ---------> 28/3=9.3a each

You see this was a very big problem when multirail was first introduced because lotsa 600w units were doing 4x20a rails and it was really around 16a continuous, and if you do quad core + sli/crossfire, a rail could go max and the other components wouldn't get enough juice and viola BSODs, resets, data loss, harmonic distortion, etc. That's why some brands(like r.i.p. TAGAN) even introduced "Combined mode" with a switch and later automatically when needed
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the rail ratings and 12v output dont match up yeh it has a few rail with each rail rated 40A 40A is the cut off point for that specific rail so that no single rail is overloaded
yes each rail cuts off at 40A but they cant handle 40A on each rail the same time
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