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Only using 350Watts of a 1000Watt PSU - Page 2  

post #11 of 20
Thread Starter 
Wow! I guess it wasn't a noob question after all, considering most of you answered it incorrectly (no offense). But after reading latelesley & mikeaj's posts, I rememember seeing some PSUs specify different efficiencies at different loads.
Quote:
Originally Posted by latelesley View Post

It depends on the efficiency numbers of each individual PSU. A 400W PSU would be running at 87.5% load (not efficiency), a 1000W supply would be running at 35% load. If the efficiency of the 1000W supply was,say , 83% at 35% load, and the 400W supply was 81% efficient at 87.5% load, then the 1000W supply would actually draw less to run your system. If the efficiency numbers were reversed, the opposite would be true. You would really need to look at the efficiency at different load levels for each supply to compare. I think in reality though, you would only be talking about a few watts of a difference.
Quote:
Originally Posted by mikeaj View Post

It really depends on the power supply models involved and how the computer is being used. What you're really interested is the efficiency of the power supplies running the loads you're using.
A 350W max system is going to be drawing a whole lot less than 350W most of the time, unless you have it maxed out running something like F@H all the time. If you're assuming that the computer is going to be on idle most of the time, a typical 400W model may be more efficient than a typical 1000W model, since most power supplies are not as efficient at lower loads like under 20%. 80+ cert only guarantees that some unit passed a certain efficiency load in their lab at a certain load pattern and low temperature, at 20%, 50%, and 100% loads.
But actually standard 80+ 1000W power supplies are pretty rare these days.
Quote:
Originally Posted by Unoriginal Sin View Post

Provided similar efficiency ratings, the answer is Yes.... however, your signature system hardly uses 300W, you won't see 350W no matter what you do with it(under air/water cooling).

Sorry, you are way off with your calculations. My sig sys is recommended to use around 430W. I have no idea where you came up with "hardy uses 300W". No offense, but you shouldn't post wrong info like that because a complete noob could blow up his system from listening to your bad advice.
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post #12 of 20
yep, depends on psu, generally best efficiency is around 40%-60% usage.
for example my SS x plat 1000watt is most efficient around 400-600 watts (90% efficient)
but it depends on actual 3.3v / 5v / 12v loads, no one loads them all up equally, and 120/240v input, etc...so im sure one could sit here arguing till they are blue in the face with a wall of calculations to prove a point tongue.gif
 
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post #13 of 20
Recommended power supply wattage and computer power draw are two completely different things.

Before you accuse people of making bad estimates, review the data:

System power consumption with Phenom II X6 at full load (subtract a few dozen watts to account for efficiency losses in power supply, GPU idle power draw):
http://www.xbitlabs.com/articles/cpu/display/phenom-ii-x6-1090t_9.html#sect0
http://www.xbitlabs.com/articles/cpu/display/core-i7-2600k-990x_12.html#sect0
http://www.anandtech.com/show/3674/amds-sixcore-phenom-ii-x6-1090t-1055t-reviewed/10

HD 6850 power consumption (of graphics card alone):
http://www.xbitlabs.com/articles/graphics/display/radeon-hd6870-hd6850_9.html#sect0
http://www.techpowerup.com/reviews/HIS/Radeon_HD_6850/26.html


Of course it depends on the overclocks, but also consider that in anything other than synthetic stress tests, you won't be pulling the max possible.
post #14 of 20
Thread Starter 
Quote:
Originally Posted by Tyreal View Post

yep, depends on psu, generally best efficiency is around 40%-60% usage.
for example my SS x plat 1000watt is most efficient around 400-600 watts (90% efficient)
but it depends on actual 3.3v / 5v / 12v loads, no one loads them all up equally, and 120/240v input, etc...so im sure one could sit here arguing till they are blue in the face with a wall of calculations to prove a point tongue.gif

Yup, looks like most PSUs are the most efficient around 50%. Thanks, looks like I'll be upgrading my TX650 to a Seasonic 750x. Main reason is for better efficiency (80+ bronze vs 80+ gold), but also because I want to make the move to modular. Thanks everyone!
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post #15 of 20
Thread Starter 
Quote:
Originally Posted by mikeaj View Post

Recommended power supply wattage and computer power draw are two completely different things.
Before you accuse people of making bad estimates, review the data:
System power consumption with Phenom II X6 at full load (subtract a few dozen watts to account for efficiency losses in power supply, GPU idle power draw):
http://www.xbitlabs.com/articles/cpu/display/phenom-ii-x6-1090t_9.html#sect0
http://www.xbitlabs.com/articles/cpu/display/core-i7-2600k-990x_12.html#sect0
http://www.anandtech.com/show/3674/amds-sixcore-phenom-ii-x6-1090t-1055t-reviewed/10
HD 6850 power consumption (of graphics card alone):
http://www.xbitlabs.com/articles/graphics/display/radeon-hd6870-hd6850_9.html#sect0
http://www.techpowerup.com/reviews/HIS/Radeon_HD_6850/26.html
Of course it depends on the overclocks, but also consider that in anything other than synthetic stress tests, you won't be pulling the max possible.

The name of my sig sys is: "Overclocked Everything".
Using the PSU calculator, my sig sys runs 380W minimum, 430 recommended.
I don't think it would be wise to run a system with a PSU that won't allow you to run synthetic stress tests.
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post #16 of 20
Take a look at the percentage figure that is used to say one power supply is more efficient than another at a certain load.It can be as small as 2-3%. Kinda like asking if driving with my lights on uses more gas,well I guess the power has to come from somewhere

Stub,give the fast cars a shot,the fast women are up to you.
Edited by PCCstudent - 4/23/12 at 5:47pm
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post #17 of 20
The described system will idle at around 100W, and load at between 250W and 325W. It may hit peaks of 350W but not often.

With hefty overclocks on air idle may hit 125W and load at 300-380W with peaks maybe to 400W.


A 400-450W power supply is ideal, but the system will not draw 400-450W.



Note, I made PSU Calc, with FiX, and wrote and tweaked all of the math. I'm also in charge of PSUs at EVGA.
Edited by Phaedrus2129 - 4/23/12 at 8:03pm
post #18 of 20
Thread Starter 
Quote:
Originally Posted by Phaedrus2129 View Post

The described system will idle at around 100W, and load at between 250W and 325W. It may hit peaks of 350W but not often.
With hefty overclocks on air idle may hit 125W and load at 300-380W with peaks maybe to 400W.
A 400-450W power supply is ideal, but the system will not draw 400-450W.
Note, I made PSU Calc, with FiX, and wrote and tweaked all of the math. I'm also in charge of PSUs at EVGA.

Thanks 4 the info. I do have a hefty OC, and I do run my system at heavy load sometimes (not rarely). I also have 7 case fans, front panel card reader, and run 2 usb devices. I'm pretty sure running this system on a 300W PSU would be dumb/dangerous.

In any case, I learn new things everyday. Today, I learned that running your PSU @50% is ideal for efficiency. Too bad the SeaSonic x650 is not on sale. Still contemplating on whether I should get the x750 because I hear it can get noisey.
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post #19 of 20
US is correct. I said 400W peak. I do think that 300W is a little low for a power supply for an X6 and a 6850. It would occasionally be overloaded and would run at a high % of load during heavy use regardless. However if it was a quality power supply there would be no real danger and probably not even instability in the short term. But I would recommend a 400W.

400-450W is ideal. 650W is unnecessary. 1000W would be wasted.

Your fans are counted into this. Your card reader and USB devices draw negligible power unless it's like a USB space heater or coffee pot or some crap.
post #20 of 20
Okay, we're done here. The thread has been cleaned up of unhelpful and/or rude and/or condescending posts rolleyes.gif

Mikeaj, Tyreal and LateLesley have provided the 'right answers', in various formats ... resident PSU guru Phaedrus has weighed in ... and in most cases you're only dealing with a few % of efficiency difference anyways ... certainly nothing I'd worry about, esp. if I already had the 1KW unit, or if I thought there was some chance I might eventually want such a powerful unit, and there was a very good deal to be had on one I liked. But it is overkill for a system like that, no doubt, and a 450-500W unit would probably be ideal imho.
Edited by brettjv - 4/23/12 at 9:29pm
    
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