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470 SLI on 600w - Page 5

post #41 of 54
True, however, if you spec your PSU to be at 95-100% capacity when every componant is under maximum draw, then by logical extension, it will be under that figure when doing stuff that isn't running everything flat out.
GPU folding for example, is pretty light on CPU use, and doesn't need to fire up the audio card, or the optical drive, or many USB devices, so you could run a single GTX480 or 580 on a 600w unit and GPU fold 24/7 and reasonably expect it to be around the peak 80% load for efficiency.
The precise point where you start impacting on the life of your PSU depends on installation and airflow as much as the load you put on it. A PSU at 50% load with terrible airflow will quite likely last no longer than a similar unit at 100% load its' whole life with good airflow. I go with 80% as a decent ballpark figure, and that's only aimed at maximising the investment you make in a good PSU.
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post #42 of 54
Quote:
Originally Posted by IntelConvert View Post
this still only varies by a couple percent... a quality PSU maybe gets 87% efficiency or so at 50-80% load. at 100% load, that PSU should still be getting 83 or 84% efficiency.

if you buy a solid, quality PSU you can virtually ignore all those little rumors and rules of the internet because the unit will be built to handle what it says it can handle, and more.
Those few percentages add up when your looking at 600+watts. If you look at the efficiency ratings for say 80+ bronze, silver & gold they are only seperated by a few %. So if you choose to run your PSU up around 100% and your running an 80+ gold PSU, it's efficiency could be down toward an 80+ bronze psu at maximum efficiency.

Not only this but running a PSU at 100% is going to increase temperatures of the PSU, which will increase the fan speed, increasing noise, thus decreasing life.. blah blah blah..

Quote:
Originally Posted by GameBoy View Post
Efficiency has nothing to do with the lifespan of a PSU.
Actually it does. Read above.
post #43 of 54
Quote:
True, however, if you spec your PSU to be at 95-100% capacity when every componant is under maximum draw, then by logical extension, it will be under that figure when doing stuff that isn't running everything flat out.
GPU folding for example, is pretty light on CPU use, and doesn't need to fire up the audio card, or the optical drive, or many USB devices, so you could run a single GTX480 or 580 on a 600w unit and GPU fold 24/7 and reasonably expect it to be around the peak 80% load for efficiency.
The precise point where you start impacting on the life of your PSU depends on installation and airflow as much as the load you put on it. A PSU at 50% load with terrible airflow will quite likely last no longer than a similar unit at 100% load its' whole life with good airflow. I go with 80% as a decent ballpark figure, and that's only aimed at maximising the investment you make in a good PSU.
what are you talking about?

its a general rule of electronics that heat is bad.... so yes airflow is important...

what load percentage or efficiency you are getting wont hurt a quality PSU.... and youre proving my point that most of the time, the PSU wont be at 100% usage and running the PSU at 100% is not detrimental to the PSU if its a quality unit.

if youre running and sub-standard unit, you shouldnt even be expecting its rated wattage.

Quote:
Those few percentages add up when your looking at 600+watts. If you look at the efficiency ratings for say 80+ bronze, silver & gold they are only seperated by a few %. So if you choose to run your PSU up around 100% and your running an 80+ gold PSU, it's efficiency could be down toward an 80+ bronze psu at maximum efficiency.

Not only this but running a PSU at 100% is going to increase temperatures of the PSU, which will increase the fan speed, increasing noise, thus decreasing life.. blah blah blah..
noise and fan speed decreases life span now? im hoping you just worded that badly.

its general knowledge that electronics dont like heat. quality PSUs can deliver their rated wattage at 40-50*C ambient temps. thats well over 100*F, so i dont think they will have any issue with what youre talking about

and 3% of 600 is 18 watts, if youre worried about 18 watts, youre doing something wrong
Edited by IntelConvert - 3/1/11 at 6:39am
    
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post #44 of 54
Quote:
Originally Posted by IntelConvert View Post
what are you talking about?

its a general rule of electronics that heat is bad.... so yes airflow is important...

what load percentage or efficiency you are getting wont hurt a quality PSU.... and youre proving my point that most of the time, the PSU wont be at 100% usage and running the PSU at 100% is not detrimental to the PSU if its a quality unit.

if youre running and sub-standard unit, you shouldnt even be expecting its rated wattage.



noise decreases life span now? im hoping you just worded that badly.

its general knowledge that electronics dont like heat. quality PSUs can deliver their rated wattage at 40-50*C ambient temps. thats well over 100*F, so i dont think they will have any issue with what youre talking about

and 3% of 600 is 18 watts, if youre worried about 18 watts, youre doing something wrong
Hmm.. ok must have worded that badly, I'm not trying to have an argument with you, and I completely agree with most of what you have just said. What I meant with the fan speed was that the fan lifespan will be shortened through higher rpm, but honestly you already worked that out.

The reason that load percentage will shorten a PSU's life is because of the increased temperatures and fan speed (fan is part of the psu), but again, you already touched on this. Obviously good quality PSU's are designed to last with high load but it does still apply.

Take care of your PSU and it will take care of you.
post #45 of 54
eventually, all electronics die... and most quality PSUs have 3, 5, 7 year warranties, so you are covered.

and like i said, they are designed to handle higher temps than any unit will see even under high stress.
    
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post #46 of 54
Quote:
Originally Posted by IntelConvert View Post
eventually, all electronics die... and most quality PSUs have 3, 5, 7 year warranties, so you are covered.

and like i said, they are designed to handle higher temps than any unit will see even under high stress.
Yeah for sure, I was kinda going off on a tangent there. I'll blame gamboy for that My inititial post was about why people target no more than 80% psu use, and I think it's quite valid actually. But moving on from that, with regards to psu's handling high temps, many psu's only seem to be rated at 40c with some exceptions at 50c. Well where I live in Australia, heat wave conditions can get upto 40c.. so the psu would be well over that I imagine. I know this is just a temp rating for it's rated efficiency, but how hot exactly can psu's get before it's a problem?
post #47 of 54
Quote:
Originally Posted by allikat View Post
True, however, if you spec your PSU to be at 95-100% capacity when every componant is under maximum draw, then by logical extension, it will be under that figure when doing stuff that isn't running everything flat out.
GPU folding for example, is pretty light on CPU use, and doesn't need to fire up the audio card, or the optical drive, or many USB devices, so you could run a single GTX480 or 580 on a 600w unit and GPU fold 24/7 and reasonably expect it to be around the peak 80% load for efficiency.

First of all if you did GPU folding on a GTX 580 you would not be anywhere near 80% capacity of a 600w PSU.

Quote:
Originally Posted by allikat View Post
The precise point where you start impacting on the life of your PSU depends on installation and airflow as much as the load you put on it. A PSU at 50% load with terrible airflow will quite likely last no longer than a similar unit at 100% load its' whole life with good airflow. I go with 80% as a decent ballpark figure, and that's only aimed at maximising the investment you make in a good PSU.
As for a PSU at 50% load with bad airflow lasting as long as a PSU at 100% load with good airflow, your point is? There are way too many variables so that statement is useless.

And maximizing the investment? No, it's called being afraid of using your PSU for what it was intended for.

Quote:
Originally Posted by eggs2see View Post
Actually it does. Read above.
Not really.
Edited by GameBoy - 3/1/11 at 7:08am
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post #48 of 54
on stock clocks for both cards your psu will sweat, but should take it no problem. +dont push you cpu to much.
post #49 of 54
Quote:
Originally Posted by Mr.Pie View Post
yes or no?

straight answer....

PSU in question: Silverstone Strider 600w 80+brozne

if not

HX650w .....yes or no?

just yes or no would do fine

assume I'll overvolt GPU's to max
add in watercooling loop and a OC'ed 32nm Xeon E5620

cheers


I'm not saying "yes" and also not saying "no". But definitely a "NO" in the long run.

I'm currently running 470SLI (overclocked) on a Corsair 650TX (sig) and it's currently holding up for now. I already ordered the XFX Pro 850w and will replace it as soon as I received it.
post #50 of 54
I think a lot of people in here really need to plug their rigs into a Kill-a-watt (or similar) and have their minds blown. Power requirements are SO overblown on this board.


Quote:
Originally Posted by faridahmed View Post
arent you facing any cpu bottleneck?
A little bit, not too bad. I scored like 500 points lower in Vantage than an i7 930 with the same overclock.
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