Power Supply Unit question

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Zahid Shabir

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Apr 5, 2015
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i have a question regarding power supplies??? if i have an 850 Watt PSU and my components only need say 650 Watts does this mean the PSU will draw 650 from the wall i.e use less electricity
 
Solution
herrwizo
Yes. PSU labelled wattage only means that the PSU *CAN* provide that much. Be aware that this rating can be deceiving, since some manufacturers mostly outright lie about the wattage and true wattage can be as much as 50% lower! That's why you need to pick a quality PSU manufacturer.

So, yes, your computer will only draw the required electricity.

The reason why people recommend PSUs with more wattage than your computer needs is that, like your car, PSUs don't like being driven in "red" zones, working under high (more than 80%) loads all the time. This increases temperatures inside the PSU and shortens their lifespan.

Get a PSU with at least 30% more than maximum your PC needs. Ideally 50%. More than that is not needed, and in extreme...
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herrwizo

herrwizo

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Feb 17, 2009
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Yes. PSU labelled wattage only means that the PSU *CAN* provide that much. Be aware that this rating can be deceiving, since some manufacturers mostly outright lie about the wattage and true wattage can be as much as 50% lower! That's why you need to pick a quality PSU manufacturer.

So, yes, your computer will only draw the required electricity.

The reason why people recommend PSUs with more wattage than your computer needs is that, like your car, PSUs don't like being driven in "red" zones, working under high (more than 80%) loads all the time. This increases temperatures inside the PSU and shortens their lifespan.

Get a PSU with at least 30% more than maximum your PC needs. Ideally 50%. More than that is not needed, and in extreme cases (say, you need 200W and get 800W PSU) it can do more harm than good, since PSUs also don't like being loaded too low (it sounds strange, but is true).

Reputable brands, among others, are Seasonic, XFX, Antec, EVGA. Use this list for reference:

http://www.tomshardware.co.uk/forum/id-2547993/psu-tier-list.html
 
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Zahid Shabir

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Apr 5, 2015
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i think i sort of got what you said but i wanted to know if i could get an 850 Watt PSU vs say the 650 and use the same electricity from the wall in energy bills due to the PC using less than the PSU max
 
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Isokolon

Isokolon

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Jul 24, 2016
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if your PC draws 350W, it doesn't matter if it's a 650W or a 850W PSU
it will just draw the 350W your components need
however oversizing is usually a bad idea since 850W PSUs are more expensive than 550W PSUs and it's better to get a 550W quality unit than a 850W junk unit
 
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Zahid Shabir

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Apr 5, 2015
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i saw a good deal on a PSU where i live in the UK for the Corsair RM850X which is £114.99 on sale at a local store within 1.5-2 miles from my house and that is the cheapest i have ever seen it even online they even sell it on eBay for the same price with 7 day delivery but i can walk to the store within 20-40 mins i trust them as they have over 300 stores in the UK and they mainly specialize in soldering PCB and components for circuit boards but they also have a mini setup with 5 PC cases and like 3 PSU and other parts in their store as it is fairly small also the cheapest i have seen the RM750X is like £104.99 which was on eBay basically most people sell the 850 for £125-£130 and sell the 750 from £115-£120
and it makes sense to future proof as i am getting the 1080 and in the future plan on going SLi as i play a lot of GTA and want 4k at least 80-100 or more FPS in max settings
 
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