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Half of PC Electricity Wasted - Page 3

post #21 of 41
I could see a 50% loss i mean in a car 75% is lost to heat.A PSU is the same thing you put the gas in (AC) and you get what you need out if it (DC) to go.Not only do the PSUs need to get "GREEN" But so so chip makers like Intel,ATi,and Nvidia.The only reason that i didnt add AMD to the list is (not becuase i am a fanboy)beacuase they are already trying to lower heat and watt out put.I know that intel is but i dont see then putting it out there as much.
    
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post #22 of 41
Quote:
Originally Posted by jonny1989 View Post
I could see a 50% loss i mean in a car 75% is lost to heat.A PSU is the same thing you put the gas in (AC) and you get what you need out if it (DC) to go.Not only do the PSUs need to get "GREEN" But so so chip makers like Intel,ATi,and Nvidia.The only reason that i didnt add AMD to the list is (not becuase i am a fanboy)beacuase they are already trying to lower heat and watt out put.I know that intel is but i dont see then putting it out there as much.
Intel has also started to do an effort on it... don't worry!
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post #23 of 41
I don't ever feel bad about any inefficiencies in my electronics because I just think about my car-- only about 20% of its power is converted to useful power.
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post #24 of 41
Quote:
Originally Posted by ted View Post
I don't ever feel bad about any inefficiencies in my electronics because I just think about my car-- only about 20% of its power is converted to useful power.
Yea, but PSU's you are converting electricty to electricty, not Gas ->heat ->motion ->electricty... Plus, cars are not run 24/7.
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post #25 of 41
Quote:
Originally Posted by Fusion Racing View Post
well not really.... its impossible to make a 100% efficient power supply... so therefore you will never get the full watts you pay for - whatever it is, energy is always wasted by it being converted into one form or another. The problem is, the electrons moving have kinetic energy - and kinetic energy gets turned into the heat and slight noise energy by parts of the power supply which resist the flow - happens when anything goes through matter, which gives the worse efficiency

that said, most good power supplies are around 80% efficient, so you aren't losing too much.
Uh...

You get all the watts you pay for. You just pull more from the plug.
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post #26 of 41
If you think about it, the majority of the energy is converted to heat as output, but not immediately. If you could magnify a processor's die until you could see the individual transistors working, the transistors are simply a bunch of on/off switches. So a) heat is produced at the power supply as a result of converting AC into DC, DC into its specific rails (12, 5 and 3.3), but then also the reason why we have extreme cooling methods is because of the opening and closing of the transistor gates on our processors. So we do get useful work out of the electricity we consume, it's just not visible to the naked eye
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post #27 of 41
Quote:
Originally Posted by Burn View Post
If you think about it, the majority of the energy is converted to heat as output, but not immediately. If you could magnify a processor's die until you could see the individual transistors working, the transistors are simply a bunch of on/off switches. So a) heat is produced at the power supply as a result of converting AC into DC, DC into its specific rails (12, 5 and 3.3), but then also the reason why we have extreme cooling methods is because of the opening and closing of the transistor gates on our processors. So we do get useful work out of the electricity we consume, it's just not visible to the naked eye
Isn't that the point though? If we can increase the amount of "useful power" (power that gets to the processor, gpu, mobo, ram, etc) and can decrease the amount of "useless power" (power lost in PSU) we can use less total power. Yes, there will be heat from the useful power, ultimately, but we want that power and heat.
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post #28 of 41
Right- The amount of power consumed by a CPU will not change from PSU to PSU, it still will draw the same amount of power regardless. However, the amount of electricity drawn from the wall can change, and that is where you are able to improve on efficiency.
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post #29 of 41
Quote:
Originally Posted by rabidgnome229 View Post
Ummm...why not?
Try it out. Run your computer without this "wasted" energy. See how well it works.
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post #30 of 41
Quote:
Originally Posted by pauldovi View Post
Can the computers run without the increased heat input? No.

Thats means it isn't wasted.
But we can significantly reduce it from 50% of the power from the wall, to easily and fairly cheeply 20%. If we want to spend more we can (according to the article) reduce it to even 7%.

[edit]

Just for fun, i ran some numbers

24 hrs/day 365 days/year .04 $/(kw*hr) = 350.4 $/(kw*yr)

So if you could reduce the amount of wasted power by 1000W, you would save $350 in one year.

Lets say that you use 350 W and have a 75% effecient PSU (total of 466 W from wall). If you could reduce it to say 93% (total of 376 W from wall), then you would be saving $31 a year.

You're going to be spending much more than that to get 93% effecient PSU's, but the point here is not that you the cost of a 75% effecient PSU will be the same as a 93% effecient PSU over the long run.... the point her is to save and conserve energy, reduce emisions.

I hate it when people say "You should spend an extra $500 to upgrade something to save you $20 a year." They have their reasoning wrong. You're not spending the money to benefit you, you're spending the money to benefit your children and grandchildren, etc.
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