How do you know how much power supply you need

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Dexterity74

Reputable
Jun 17, 2015
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Hello, i need to know what power supply i need my pc isn't finished yet but ill tell you what i have so far.

Intel i7-4820K FCLGA2011 3.70 GHz 64 bit Processor 10MB Cache

ASUS X79-DELUXE ATX DDR3 1333 LGA 2011 Motherboards

EVGA GeForce GTX 750Ti SC 2GB GDDR5 Graphics Card

1TB Desktop 3.5 Inch SATA 6Gb/s 7200rpm Internal Hard Drive

Corsair Vengeance 8GB (1x8GB) DDR3 1600 MHz (PC3 12800) Desktop Memory (RAM)

I just want to make sure the power supply I get can handle this. Thank you!
 
Solution
A
With a 450 or 550w one you are good. But buy a good one, with gold or silver eficiency.

If you put your parts on pcpartpicker.com it will say how much power you need.
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smorizio

smorizio

Titan
Jan 22, 2010
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what your looking for is not the total wattage of the power supply. but the 12v plus rail. some power supplys have one some have more then one. your look at the amp rating and voltage output. then you want to look at the wattage of the cpu and gpu. (gpu max voltage). add them together and make sure you have 100w or more for over head and cap age.
with power supplys there sweet spot is 50 percent-70 percent. you also with the wattage want to think if your gong to replace the gpu or add another to do sli or crossfire that the unit is sized right. you dont want to have to buy two power supplys and pull the one that too small at a latter date. if your going to put in a high end gpu go with a 750w power supply if your going to sli or crossfire then go with a 1000w unit to be safe.
 
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