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Too much power?


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#1 theonlybuster

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Posted 13 June 2014 - 02:01 PM

I just finished re-building an computer rig from about 4yrs ago.  Long story short, I've used a few PC Part calculator websites and applications to discover my build requires roughly about 250 watts of energy to effectively run. 
As time goes on, I'm expecting, AT MOST, to MAYBE add in an additional hard drive (roughly 20W).  I have enough USBs and cooling fans so I shouldn't need/want much else. 

My power supply is 600 watts... Yes I know, overkill. My question is should I downsize my power supply and if so what would be a good Watt power supply to invest in?  I was thinking a 280W supply should be just fine for my needs. 

My main reason for asking is because I've heard power supplies shouldn't supply 100% of their power when possible, as well as down the road at (for example) 300W power supply will start to diminish and supply less energy.  I'm assuming this drop is roughly 10%, but again, just my assumptions. 

If I'm missing any info please let me know and I'll try to include as much info as possible. 

It seems every question I have is answered the quickest and most effective here, so again and again I find my way back to the forums of BleepingComputer



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#2 wpgwpg

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Posted 13 June 2014 - 02:10 PM

 I've always heard you should add up your power requirements, then double them for a power supply.  Bear in mind that power supplies lose some of their ability over time.

 

Good luck.


Everyone with a computer should back his system up to an external hard drive regularly.  :thumbsup:

#3 hamluis

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Posted 13 June 2014 - 05:36 PM

I would not downsize :).

 

What would be the point?

 

The goas should always be to have more than you need...not to tax the PSU and create system problems that are totally unnecessary.

 

IMO, the idea is analogous to uninstalling RAM so that you have just enough to barely run Windows.  Why would anyone do that?

 

Louis



#4 jonuk76

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Posted 13 June 2014 - 06:22 PM

Power supplies have an efficiency bell curve. Basically efficiency is normally at it's highest near the middle of it's output range (approx 40-60%), and drops as it approaches it's limits at the upper and lower end.   Some more detailed explanations can be found here.

 

Once you take account of the reduction in capacity as a PSU ages, the possibility of adding further parts at a later date, and just allowing for a certain margin of safety... Calculating what you need and going 50% to 100% over is not a bad approach :)

 

Short answer, I would certainly not recommend you downgrade to a 280w PSU.  However if the 600w PSU is of the budget, no-name variety then I wouldn't argue against changing to a decent quality 400-ish watt PSU.  Things like the Corsair CX430 is better than a generic and usually there are offers about so they can be picked up cheaply.


Edited by jonuk76, 13 June 2014 - 06:31 PM.

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#5 theonlybuster

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Posted 14 June 2014 - 06:35 AM

Well my reason for downgradingthe PSU was because I figured I figured I had all this extra power that I figured I'd only use 50% at most.  My assumptions were wrong, and thankfully I had the mindset to inquire before making a big mistake.  Thanks guys.






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