Power supply question

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elieselhachem

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Mar 10, 2013
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I have a 1000 watt power supply and my system need 650 watt, I bought this power supply maybe in the future I want a SLI, my question is , my system need 650 watt, the power supply give the system 650 watt and take from home electricity 650 watt or always take from home electricity 1000 watt, give the system 650 watt and the rest 350 watt discharge them in himself ? thank u
 
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elieselhachem

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Mar 10, 2013
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10,510


thank u for your reply, I have the i7 3770k 16 gb ram hyperx , and the gigabyte gtx 680 windforce, X6 fan , dvd RW, sata 3 1TB , z77x D3H
 
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jnkweaver

jnkweaver

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Nov 11, 2011
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Your system as listed is probably pulling closer to 400W. As other people have said the power supply only draws what it needs (minus efficiency). If your supply is 80% efficient and it needs 1000W it will draw 1250W from the outlet
1250W x 80% efficient= 1000W

If you want to know how much draw it has then find a good review on your psu and it will tell you the efficiency, then plug your computer into a kill a watt http://www.amazon.com/s/?ie=UTF8&keywords=kill+a+watt&tag=googhydr-20&index=electronics&hvadid=8501321471&hvpos=1t1&hvexid=&hvnetw=g&hvrand=2897855321091966742&hvpone=&hvptwo=&hvqmt=e&hvdev=c&ref=pd_sl_98x9f93sdk_e
That will tell you the draw and multiply that by the efficiency and get what your system is drawing.
 
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ko888

ko888

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Feb 18, 2009
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If your system components only need 400 Watts to run and if your PSU has 80% conversion efficiency at that power draw level then you should be able to measure a power draw of 500 Watts at the PSU's AC power plug.

The 100 Watt difference is the result of the power used by the PSU during the AC to DC conversion process and you'll notice that as the heat that warms up and exits the power supply during its use.

More efficient PSU's, like the ones that have 80 PLUS Platinum level efficiency, will barely even feel warm during their operation. If the system's power draw is 400 Watts and the PSU's conversion efficiency is 90% then you should measure 444 Watts at the PSU's AC power plug.
 
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