Should i get a 700w PSU if total watt for PC will be 400ish watt?

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SnowMare

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Aug 21, 2016
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1.) Will getting a 700watt PSU damage any components if the system only need about 450W?
2.) will all that unused wattage increase in my power bill?


im gana use a i5 4590 and a rx 480, i will et another 480 in a year so thats y im looking at the 700w
 
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N3rdR4ge
1) you generally want to aim for a draw of 50% of the maximum psu wattage for an efficiency/heat standpoint. so, 700w max is ~65% of 450w which is still great. using much higher or lower percentages will lower efficiency and raise your power bill. over wattage is not a factor in component damage. keep in mind, if you plan to add another rx480, you may want higher max wattage to keep it around 50%.

2) your psu will only generate the wattage your computer is drawing. so if your computer is pulling 450w, your psu will output only 450w, not 700w. the extra wattage makes no difference in that sense. you could have a 1600w and have the same power bill.

side note:
80+ gold means at 50% draw, your psu is 90% efficient.
so, every 100w...
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Baumy15

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May 12, 2014
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short answer: yes long answer: YYEESS

more wattage is always good, it means you have extra room for overclocking and more components in the future
 
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N3rdR4ge

N3rdR4ge

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Jun 16, 2014
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1) you generally want to aim for a draw of 50% of the maximum psu wattage for an efficiency/heat standpoint. so, 700w max is ~65% of 450w which is still great. using much higher or lower percentages will lower efficiency and raise your power bill. over wattage is not a factor in component damage. keep in mind, if you plan to add another rx480, you may want higher max wattage to keep it around 50%.

2) your psu will only generate the wattage your computer is drawing. so if your computer is pulling 450w, your psu will output only 450w, not 700w. the extra wattage makes no difference in that sense. you could have a 1600w and have the same power bill.

side note:
80+ gold means at 50% draw, your psu is 90% efficient.
so, every 100w from your wall becomes 90w from the psu to your machine.

efficiency chart:
https://en.wikipedia.org/wiki/80_Plus
 
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