how many watts do i need for my system?

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valleron2010

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Feb 16, 2015
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i5 4460
r9 290 crossfirex(saphirre reference)
ddr 3 8gb
3 usb
2 case fans,
there is a power supply calculatoros like msi that says minimum wattage psu for me is 650 watt.is that true?
 
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Eliomiller

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Feb 15, 2015
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I would recommend you 1200w EVGA P2 series as its platinum certified and a PSU generally give nearly 20-10% less wattage than what was written on the box due to heats.it also begin loosing efficiency after nearly a year so if you want the PSU to be future proof for at least 3-4years then go with EVGA P2 1200W PSU as they are known for their efficiency and durability.
 
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sizzling

Titan
Oct 18, 2006
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That is completely false. A good quality psu will reach its rating often with a peak above its rating. Poor quality PSU's often don't reach their rating because the supplier lies.
 
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Eliomiller

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Feb 15, 2015
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sizzling, do you know what is the 80+ rating? well if you know that then you should know that this rating mean the percentage the PSU achieve of its rating. if what you say was right the PSU's wouldn't create heats but it does so that prove what im saying,the percentage of wattage lost is fixed by the rating of the PSU,for example, a PSU with a 80+ gold is better than a 80+ bronze.
 
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sizzling

Titan
Oct 18, 2006
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You are so wrong in your understanding it is scary yet you are trying to inform others. Ok lets start simple, a good quality 500w 80+ PSU can deliver 500w to your components continuously. The 80+ rating means it does this with up to 80% efficiency meaning to deliver 500w to your components it will draw up to 625w from the wall, a 90% efficiency will take up to 555w from the wall but both deliver 500w to your PC. The bronze, silver, gold, platinum rating has ZERO impact on the watts delivered to your components, its impacts how much the psu draws from the wall to do so. Another misconception is that bronze, silver, gold, platinum is directly related to quality of the unit, it is not. A well designed psu using lower quality components can still be efficient but the components are more likely to fail under load.
 
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sizzling

Titan
Oct 18, 2006
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Here you go, I even Google'd an article for you http://www.techpowerup.com/forums/threads/how-does-psu-efficiency-affect-me-and-do-i-really-need-an-80-plus-gold-power-supply.129456/

Here is a key extract "I've seen people say that you take the Wattage rating of the PSU, and the efficiency is how much power the PSU can really output for your component. That means that a 500w PSU, rated for 80% efficiency will only be able to supply 400w. This is wrong. A 500w PSU should be able to output 500w to your PC components in one form or another. Efficiency has nothing to do with this."
 
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