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Which energy efficient, reliable ~200-250w PSU? - Page 2

post #11 of 16
Quote:
Originally Posted by icehotshot View Post

Quote:
Originally Posted by stumped View Post

guys, i need something in the 200-250w range, 300+ is way overkill for my system.

but thanks for the suggestions.

Is there a reason you can't get a quality 350 Watt power supply? Honestly that is basically where the quality/availability starts.

Also do realize that power supply size does not affect power consumption if that is what you were worried about. A 1000W psu and 300W psu, with the same 80 plus rating, will both draw the saw amount of power from the wall if your system is using 150W.
i beg to differ with you.

efficiency takes a huge nosedive when going below 20% of a PSUs rated load, between 3% - 7% depending on if its 80+, bronze, silver . .the lower the "rating" the higher the efficiency loss.

go take a look at the "low load" tests on johnnyguru to see what i am talking about.

with a 150 watt load the 300 watt PSU will draw 187.5 watts @ 80% where as the 1000 watt will be drawing 205.5 watts @ 73% efficiency.

edit: actually the 300 watt PSU ought to have 82%+ at 50% load . . .
Edited by looniam - 6/28/13 at 9:57am
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post #12 of 16
Quote:
Originally Posted by looniam View Post

i beg to differ with you.

efficiency takes a huge nosedive when going below 20% of a PSUs rated load, between 3% - 7% depending on if its 80+, bronze, silver . .the lower the "rating" the higher the efficiency loss.

go take a look at the "low load" tests on johnnyguru to see what i am talking about.

with a 150 watt load the 300 watt PSU will draw 187.5 watts @ 80% where as the 1000 watt will be drawing 205.5 watts @ 73% efficiency.

edit: actually the 300 watt PSU ought to have 82%+ at 50% load . . .

So then a 300-350W gold rated psu would be a sweet spot for efficiency for the OP, no?

BTW: yea that completely blanked my mind because I was thinking gold rated instead of "any 80 plus" rating when I wrote it. Then the difference would only be 3% which is not really anything to be concerned about.
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post #13 of 16
Quote:
Originally Posted by icehotshot View Post

Is there a reason you can't get a quality 350 Watt power supply? Honestly that is basically where the quality/availability starts.

Also do realize that power supply size does not affect power consumption if that is what you were worried about. A 1000W psu and 300W psu, with the same 80 plus rating, will both draw the saw amount of power from the wall if your system is using 150W.

That is not quite true.
A 150w used from a 1000w PSU is only a 15% load.
A 150w used from a a 300 PSU is a 50% load.

PSUs have efficiency curves... Odds are the 1000w PSU is utilizing more power than the 300w PSU. More advanced modern PSUs do have flatter efficiency curves and the variation is only a few percent. However, at very low loads.... like his system idling, the can be significant differences.

For example: http://www.hardwaresecrets.com/imageview.php?image=10583

EDIT: Got beat to it!
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post #14 of 16
I can make a firsthand observation about the "too big" power supply question. I use my 620 Corsair (really a Seasonic unit) for i7-920,930 folding. It is well within its rating. If I use my "overated" 850 Corsair for the same job I have much less heat pouring out of the 850. We all know that 850W is overkill for one single cpu that is folding but it sure drops the heat output.
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post #15 of 16
Quote:
Originally Posted by PCCstudent View Post

I can make a firsthand observation about the "too big" power supply question. I use my 620 Corsair (really a Seasonic unit) for i7-920,930 folding. It is well within its rating. If I use my "overated" 850 Corsair for the same job I have much less heat pouring out of the 850. We all know that 850W is overkill for one single cpu that is folding but it sure drops the heat output.

No power consumption meter?
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post #16 of 16
Quote:
Originally Posted by DuckieHo View Post

No power consumption meter?

No, no meter but it is a safe bet the 620W is pulling more watts as it is making more heat. The energy for that heat has to come from somewhere. What gets me is the change in heat output is so dramatic.
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