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Originally Posted by scandium
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Originally Posted by SUBMAN1
Some of you may already be running a 'Greener PC' without knowing it. I am talking about PSU's that have an Active PFC (Ever seen 99% efficient Active PFC written on the side of a PSU?). Its all great and all in that it uses way less power. Bad news is, most of us here are billed by the kilowatt per hour scale, so even though you are using less power, you are still getting billed the same. Nice huh?
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Hmm not really sure about that one. Let's take a couple hypotheticals (with nice round numbers):
#1 PSU is 500W with 80% efficiency and we'll say the average draw from the PC components is 400W so to provide that the PSU needs to draw 500W from the AC mains and therefore each hour it runs the system consumes .5 KWh (20% of which, or 100W is lost due the PSU's inefficiency);
#2 PSU is 500W with 100% efficiency and average draw is again 400W but this time only 400W needs to be drawn from the AC mains and the average consumption is .4 KWh with no loss.
From both examples if you're billed per KWh then #1 PSU is costing you .1 KWh more of electricity for every hour you run it. These examples are a little inflated though as you would need a very high end gaming rig to have that kind of power requirement, and then the high load would only be seen during gaming... plus no PSU is 100% efficient. |
I should re-word that to read Power Factor Correction Efficiency, which is different than the Power Supplies overall efficiency.