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buying extremely overpowered PSU

post #1 of 25
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I've been told that buying an unnecessarily high wattage PSU will increase efficiency, coolness and overall longevity. If I only ever plan to draw 800w(max) from a 1200w power supply, what are the advantages vs just a 850w power supply? Plan on both being 80+ platinum or gold. Money isn't a factor.
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post #2 of 25
Quote:
Originally Posted by UsernameGoesHer View Post

I've been told that buying an unnecessarily high wattage PSU will increase efficiency, coolness and overall longevity. If I only ever plan to draw 800w(max) from a 1200w power supply, what are the advantages vs just a 850w power supply? Plan on both being 80+ platinum or gold. Money isn't a factor.

No it will not. It will typically be the opposite because whenever you aren't gaming your rig is barely drawing any power. At that low of a load efficiency actually decreases. What are you trying to run?
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post #3 of 25
I've read in random threads that buying a higher watt power supply does not always increase efficiency. Most power supplies are most efficient under a certain amount of load.
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post #4 of 25
Quote:
Originally Posted by skylinecalvin View Post

I've read in random threads that buying a higher watt power supply does not always increase efficiency. Most power supplies are most efficient under a certain amount of load.

yes that is true. You want to get a power supply that fits your rig. You won't really see much of a difference when it comes to efficiency (technically there is a difference) but really the big thing is that it is completely pointless to get a massive power supply when you aren't going to be running four 480s.
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post #5 of 25
there is what they call an EFFICIENCY CURVE, too much power draw or too little power draw will lower efficiency.
post #6 of 25
Only time it really makes any difference is when you fold 24/7 then you can actually see a noticeable difference. On a normal/gaming machine you won't notice it much at all.
post #7 of 25
Peak efficiency is around %50, but it's only going to be 2-4 percentage points from %80+ load so it's not as big a deal as you'd think.

The longevity is IMO the more interesting question, but I can't recall ever seeing a legitimate study of that.

My personal belief is that a PSU running %60-70 will last longer than one that's near full capacity if you stress your PC often, just by common sense. I don't know if anyone has any data to prove or disprove however.
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post #8 of 25
Quote:
Originally Posted by VW_TDI_02 View Post

yes that is true. You want to get a power supply that fits your rig. You won't really see much of a difference when it comes to efficiency (technically there is a difference) but really the big thing is that it is completely pointless to get a massive power supply when you aren't going to be running four 480s.

Four 480's? Oh Jesus

   
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post #9 of 25
Quote:
Originally Posted by 2thAche View Post

Peak efficiency is around %50, but it's only going to be 2-4 percentage points from %80+ load so it's not as big a deal as you'd think.
The longevity is IMO the more interesting question, but I can't recall ever seeing a legitimate study of that.
My personal belief is that a PSU running %60-70 will last longer than one that's near full capacity if you stress your PC often, just by common sense. I don't know if anyone has any data to prove or disprove however.

I've always heard that 80% is where the peak efficiency is at. Also unless you are folding on both CPU and GPU 24/7 you won't be stressing your computer that often.
Quote:
Originally Posted by Mr357 View Post

Four 480's? Oh Jesus
That thing grossly overestimates power supply necessities...
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post #10 of 25
As a typical reference, here is the efficiency of the latest 850W Dark Power Pro by Be Quiet! (80+ Platinium) :

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