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multi rail combined ampage?

post #1 of 17
Thread Starter 
so im looking at this PSU (not going to buy though) and im wondering if a low quality PSU like this has combined allowed ampage on each 12v rail or if it is shared. thanks

edit: lol i forgot to include the link http://www.aria.co.uk/Products/Compo...roductId=39800
Edited by JY - 2/3/11 at 3:20pm
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post #2 of 17
pretty sure each rail can only do what it says when a graphics card says it needs 40 amps its talking about the 12V rails combined amperage.
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post #3 of 17
Thread Starter 
Quote:
Originally Posted by philhalo66 View Post
pretty sure each rail can only do what it says when a graphics card says it needs 40 amps its talking about the 12V rails combined amperage.
are you sure? you might know that our GX2's require 40A
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post #4 of 17
Quote:
Originally Posted by jy360 View Post
are you sure? you might know that our GX2's require 40A
i know my psu pushes 50 amps between the 2 12V rails. from what i understand each rail is combined to make 1 rail when running a graphics card. it pulls so many amps from one PCI Express Cable then takes so much from the other rail of course i only have a basic knowledge on this sort of stuff stuff i could be wrong.
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post #5 of 17
Given the price and brand, this smells like a piece of ****. Also, looking at the power distribution sticker, there is no mention of the 12V rail's actual rating, only a combined rating for all rails, which is highly suspicious.
Generally speaking though, you can never combined the rated amperages of the individual 12V rails, e.g. in this case two 28A rails do not mean you have 56A available. Even if you did though, that's still only 672W, which is way under what a 850W unit should have. But most likely that unit cannot even deliver 672W.
Anyway, somewhere on the sticker, there should be a mention that says what the maximum output of the 12V rails combined is, such as on this PSU for example:

You can see it's got four 12V rails rated for 20A each, but of course a 550W unit does not deliver 80A of 12V power. Instead, underneath the table is a mention that states +12V1, +12V2, +12V3, +12V4 max. load: 45A.
Any self-respecting PSU should have that clearly marked on its sticker in some way.

The ampere figure for an individual rail states how the OCP was calibrated on that particular rail, i.e. how much power can travel on that particular copper trace before the unit will shut down harmlessly as a safety measure.
post #6 of 17
Thread Starter 
Quote:
Originally Posted by philhalo66 View Post
i know my psu pushes 50 amps between the 2 12V rails. from what i understand each rail is combined to make 1 rail when running a graphics card. it pulls so many amps from one PCI Express Cable then takes so much from the other rail of course i only have a basic knowledge on this sort of stuff stuff i could be wrong.
yeah, its low quality though so it would probably eventually fail whilst folding or something
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post #7 of 17
Thread Starter 
Quote:
Originally Posted by Shub View Post
Given the price and brand, this smells like a piece of ****. Also, looking at the power distribution sticker, there is no mention of the 12V rail's actual rating, only a combined rating for all rails, which is highly suspicious.
Generally speaking though, you can never combined the rated amperages of the individual 12V rails, e.g. in this case two 28A rails do not mean you have 56A available. Even if you did though, that's still only 672W, which is way under what a 850W unit should have. But most likely that unit cannot even deliver 672W.
Anyway, somewhere on the sticker, there should be a mention that says what the maximum output of the 12V rails combined is, such as on this PSU for example:

You can see it's got four 12V rails rated for 20A each, but of course a 550W unit does not deliver 80A of 12V power. Instead, underneath the table is a mention that states +12V1, +12V2, +12V3, +12V4 max. load: 45A.
Any self-respecting PSU should have that clearly marked on its sticker in some way.

The ampere figure for an individual rail states how the OCP was calibrated on that particular rail, i.e. how much power can travel on that particular copper trace before the unit will shut down harmlessly as a safety measure.
ahhhhhh, you learn something new every day huh. thanks lots, +rep for you
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post #8 of 17
Quote:
Originally Posted by jy360 View Post
yeah, its low quality though so it would probably eventually fail whilst folding or something
what? how is it low quality? been running it for almost 3 years not one single problem, you know just because it didn't cost over 300 dollars doesn't mean it isn't good
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post #9 of 17
I just noticed something else that's funny:
• 1x 20+4 Pin Main Connectors
• 1x P4 4-Pin 12V Connectors
• 4x 4-Pin Molex Peripheral Connectors
• 4x SATA Connectors
• 1x 6-Pin PCIe Connectors
• 2x Floppy Drive Connectors

That's a hilarious set of cables for a 850W unit
post #10 of 17
Thread Starter 
Quote:
Originally Posted by Shub View Post
I just noticed something else that's funny:
• 1x 20+4 Pin Main Connectors
• 1x P4 4-Pin 12V Connectors
• 4x 4-Pin Molex Peripheral Connectors
• 4x SATA Connectors
• 1x 6-Pin PCIe Connectors
• 2x Floppy Drive Connectors

That's a hilarious set of cables for a 850W unit
yeah it looks pretty awful. why is it they can sell it rated at 850w ?
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120GB Kingston HyperX SSD, 250gb HDD x3 +660Gb 5870 Accelero Xtreme Corsair H100  win 7 ultimate 64bit (stipped to bone) 
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