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post #9311 of 12471
Power draw from the wall has nothing to do with how much your system uses

Your system will never use more then 650 watts even with two 7950 cards and overclocks on everything

So no 750 watts is more then enough

If your PSU is 90% efficient that just means it will draw 650 watts for your system plus 10% extra from the wall

That would be 715 watts total
Edited by shilka - 10/17/13 at 9:12am
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post #9312 of 12471
Quote:
Originally Posted by shilka View Post

Power draw from the wall has nothing to do with how much your system uses

how could it not? the efficiency rating is the amount of power drawn at the wall which is actually supplied to the system
   
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post #9313 of 12471
Quote:
Originally Posted by jchap1590 View Post

how could it not? the efficiency rating is the amount of power drawn at the wall which is actually supplied to the system

Power from the wall has to be coveted otherwise your system would catch fire

When it convets from wall power to power your system needs it loses some of that power

That power ends up as heat

More efficient means less is lost and less has to been drawn from the wall
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post #9314 of 12471
Quote:
Originally Posted by jchap1590 View Post

how could it not? the efficiency rating is the amount of power drawn at the wall which is actually supplied to the system

this is just confusing me more. I've been told 3 different things already.

what no one ever mentions is what exactly that wattage rating is on the side of the PSU; is it the amount of power supplied to the system, post-efficiency compensated, or is it the amount of power it draws from the wall, pre-efficiency compensated?
   
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post #9315 of 12471
Quote:
Originally Posted by jchap1590 View Post

this is just confusing me more. I've been told 3 different things already.

what no one ever mentions is what exactly that wattage rating is on the side of the PSU; is it the amount of power supplied to the system, post-efficiency compensated, or is it the amount of power it draws from the wall, pre-efficiency compensated?

Also throw in build quality with some units that cant do what they are rated for and some that can do more then they are rated for

But a 750 watts PSU does not use or give 750 watts to your system it only takes what your system needs not less or more

750 watts is what it is rated to give to your system

So if your system uses 750 watts it takes 750 watts plus that extra from the wall and thats what its rated for

Or at least that is how i understand it
Edited by shilka - 10/17/13 at 9:28am
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post #9316 of 12471
Quote:
Originally Posted by shilka View Post

Also throw in build quality with some units that cant do what they are rated for and some that can do more then they are rated for

But a 750 watts PSU does not use or give 750 watts to your system it only takes what your system needs not less or more

750 watts is what it is rated to give to your system

So if your system uses 750 watts it takes 750 watts plus that extra from the wall and thats what its rated for

Or at least that is how i understand it

what I just don't get is if a PSU supplies (or, more accurately, has the POTENTIAL to supply) the amount of wattage that's written on the side of it, why do people always have to throw in the bits about efficiency and draw at the wall outlet? why does that matter? a 750 W PSU is a 750W PSU, is it not? does it matter if it's 80+ bronze or gold or titanium? it seems to cause a lot of unnecessary confusion for those who don't understand what the efficiency rating means but just want to know how many watts their system requires. personally, I couldn't care less how much power is drawn from the wall.
   
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post #9317 of 12471
Quote:
Originally Posted by jchap1590 View Post

what I just don't get is if a PSU supplies (or, more accurately, has the POTENTIAL to supply) the amount of wattage that's written on the side of it, why do people always have to throw in the bits about efficiency and draw at the wall outlet? why does that matter? a 750 W PSU is a 750W PSU, is it not? does it matter if it's 80+ bronze or gold or titanium? it seems to cause a lot of unnecessary confusion for those who don't understand what the efficiency rating means but just want to know how many watts their system requires. personally, I couldn't care less how much power is drawn from the wall.

You would be surprised at some of the crap out there that cant do anywhere close to what the brand say its rated for

Lower efficiency means you have to pay more money on your power bill Vs higher efficiency

Which is why many like 80 plus gold or higher

What many misunderstand is 80 plus is not a sgin of quality nor is it something you should base your purchase on

In fact i know crappy PSU´s that are 80 plus gold
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post #9318 of 12471
All this PSU talk is exactly why I just bought a AX1200 and don't worry about it
post #9319 of 12471
Quote:
Originally Posted by GraveDigger7878 View Post

All this PSU talk is exactly why I just bought a AX1200 and don't worry about it

Its way overkill so you have droped the efficiency way below gold

You are running it so low you might as well have bought a bronze rated PSU

Half the power would have been enough
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post #9320 of 12471
Quote:
Originally Posted by shilka View Post

What many misunderstand is 80 plus is not a sgin of quality nor is it something you should base your purchase on

that's exactly what I'm saying

basically, this...


(a more efficient power supply will not increase the maximum potential output to your system, but rather it will lessen the amount of power drawn from your electrical system)

I think this only becomes a more prominent selling point in situations such as data centers, where there is much more than just one PSU contributing to the inefficiency of the amount of power taxed upon your electrical system
Edited by jchap1590 - 10/17/13 at 10:33am
   
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