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post #11 of 20
I swear the misinformation in this thread is making my brain hemorrhage...
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post #12 of 20
Quote:
Originally Posted by beers View Post
What? No.

Your PSU provides voltage and amperage.
Volts * Amps = Watts

Voltage will stay the same to your components, but they will pull whatever amperage they require. A 500w unit doesn't 24/7 pull 500w and vanish the rest into thin air. If your components only require 100-150w, that's roughly what your PSU will pull from the wall (take efficiency into account).
You misunderstood me. I was saying that if the components draw 400w the psu will draw~500w from the wall, and ~100w is wasted because the psu is not 100% efficient. The components could draw 200w the psu would draw 250w and ~50w would still be wasted
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post #13 of 20
Thanks for helping to clear this up with me and the OP
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post #14 of 20
Quote:
Originally Posted by Kasp1js View Post
You misunderstood me. I was saying that if the components draw 400w the psu will draw~500w from the wall, and ~100w is wasted because the psu is not 100% efficient. The components could draw 200w the psu would draw 250w and ~50w would still be wasted
Fair enough mate, it looks like I jumped to conclusion a bit hastily..
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post #15 of 20
Sigh. Let's make this very simple.

Say for example, we have a Seasonic M12 II 520.
This is our 500-watt DC output supply.

Ignore efficiency for the time being.

Assume your rig consists of a dual-core CPU, one mid-range graphics card like the HD5770, one HDD, one DVD writer, and of course, standard array of stuff like your motherboard, fans, card reader and whatever other peripherals you may want to slot in a 3.5" bay.

Assuming all parts are not overclocked, this rig draws 250W or less at maximum load. This is DC power.

Therefore, all it will draw from our 500-watt DC output PSU, is 250W.
This is assuming that efficiency is 100%.
Of course, in the real world it won't.

Now the job of a PSU is to take AC current from the wall, convert it to DC, then step it down from 110 or 240V depending on your location, to 3.3V, 5V and 12V voltages that the different parts of our PC needs to operate on.

This conversion and stepping down is done by a transformer, or transformers alongside many other parts.
The process produces heat.
Therefore, some of the input energy is wasted as heat.

Back to our example.

If you connected my example system to a 100%-efficient, 500W power supply, and then plug in a Kill-A-Watt or similar power meter to the wall, you'd notice it draws exactly 250W.

However, in the real world, efficiency is not always 100%.

Assuming 80% efficiency at a 250W DC load level, you take 250 and multiply it by 120%.
This will be the amount of power being drawn from the wall, in real life.

Therefore, it is not true that a 500W PSU will always draw 500W from the wall.
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post #16 of 20
Revision: A 100% efficient PSU wouldn't produce heat

Also, the equation is a bit off.
You can easily find power draw through proportions.

80/100 (80% efficiency) compared to 250w DC Load/x (AC Load)
250 * 100 / 80 = 312.5w from the wall
Edited by beers - 1/31/11 at 5:23am
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post #17 of 20
That's some good info there
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post #18 of 20
Quote:
Originally Posted by beers View Post
Revision: A 100% efficient PSU wouldn't produce heat
LOL.
That wasn't exactly what I was trying to drive at, but yeah. HAHA.
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post #19 of 20
OK, I lost my edit button for some reason, so don't mind me if I necropost.

This is one of the points of getting a good power supply.

A lousy power supply, more often than not, employs low-quality parts, shoddy workmanship, and therefore yields poor results.

Not only does the power output from a lousy power supply have the potential to kill your rig - a lousy power supply is unable to achieve the efficiency of a quality one, and therefore contributes more heat, and consumes more power.

It also does not last as long as a good power supply.
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post #20 of 20
Quote:
Originally Posted by beers View Post
Revision: A 100% efficient PSU wouldn't produce heat

Also, the equation is a bit off.
You can easily find power draw through proportions.

80/100 (80% efficiency) compared to 250w DC Load/x (AC Load)
250 * 100 / 80 = 312.5w from the wall
Finally someone who knows how to calculate efficiencies correctly. If a power supply rated at 500watts is rated at 80 percent efficient that doesn't mean you just multiply the load by 80 percent. It means that the ratio of power being supplied to the power being drawn makes a ratio of 80 percent. So the 62.5 watts dissipated within the power supply is from heat dissipation of switching regulators, transformers, and bridge rectifiers.
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