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How much is wasted

post #1 of 5
Thread Starter 
Lets not let this thread get into if the user should have a 1000w power supply installed in the first place,that is not the question.The question is how much power is wasted when a 1000w power supply is used when a 400w would be a perfect fit. Do not try and make the question into anything other than what it is.The 400w will be operating at its most efficient load range and the 1000w will not be operating at its most efficient load range,what will the "waste" be? Your answer need not need to be exact,it need not be expressed in watts (unless you care to).I would most likely expect an answer expressed in percentage.
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post #2 of 5
how efficient are either units? that is the main question if they are certified at the same level the difference will be minimal

most power wastage comes from the pc in idle where the 1000 watt psu is operating in its 10% range which is where no mid range psu will be at its best and the 400 watt psu will be in its effective range of 25% of capacity
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post #3 of 5
Efficiency varies at different loads. 40%-80% being in average the most efficient range for PSU.

There is what we call rating. 80plus being the worst and titanium being the best. A 500W titanium PSU will be more efficient than a 2000W 80plus PSU.
So let's imagine both PSU are pushed to use 500W
The 80plus rating is 80% efficiency while the titanium is >90% (let's assume it is rated at 90%).

The 2000W unit will use 625W while the 500W unit will require 555W to deliver 500W of current.

You will have to select two units you are interested, jonnyguru.com will answer for the rest, as they test every units they have for the efficiency at any wattage.

In short, to answer to your question and as said above, it depends which unit you use.

Side note: While the efficiency difference between the worst & best rating is quite high (>10%), current PSU on market are rated bronze (82%), silver (85%) and gold (87%) while platinum (89-90%) & titanium (>90%) are quite expensive and rare. So, is the price difference worth the, at best, 10% gain in efficiency? If you are running 24/7 on load, yes. If you are causal or gamer (few hours per days) the difference is going to be quite low.
Edited by Just a nickname - 4/24/12 at 2:47pm
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post #4 of 5
This could be figured out, to a close approximation, by picking particular units in the range you selected and then looking up their 80+ ratings to see exactly what efficiency they had at certain levels of power consumption.

I haven't done the math but the difference won't be very big on units with the same efficiency rating, platinum, gold, etc. I'm thinking only a few percent would be wasted.
post #5 of 5
Thread Starter 
I accept that the wasted electrical energy will be minimal.Thanks +rep to all
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