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How many watts should my power supply be ?

So I built this computer a year ago probably just to play Dota 2 :

AMD A6-6400k 3.90 GHz
MSI A55m-E33
4 GB DDR3
1TB 7200RPM
and a cheap case with a 400w psu on it

but everything changed when the Steam Sale attacked. I bought so much games but my PC couldn't run them because I don't have a discrete video card. So I bought an R7 250 and slapped it on my system. But, out of curiosity I checked out Newegg Power Supply Calculator, put in my specs then I'm suprised that it said I NEED 678 W ! and I feel like my PC should perform better when I'm playing games but it I feel like its performing slow that I expect it to be.

So, my question is: Do I need to buy a 700w PSU for my system to run better ?
4 answers Last reply Best Answer
More about watts power supply
  1. nope. Antec VP-450 will deliver clean power to all your components for little (38 dollars)
  2. Calculator's are a joke , this will run it.

    PCPartPicker part list / Price breakdown by merchant

    Power Supply: EVGA 430W 80+ Certified ATX Power Supply ($27.99 @ Micro Center)
    Total: $27.99
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2014-08-04 20:48 EDT-0400


    Or for extra power at a great price.

    PCPartPicker part list / Price breakdown by merchant

    Power Supply: EVGA 500W 80+ Bronze Certified ATX Power Supply ($34.99 @ NCIX US)
    Total: $34.99
    Prices include shipping, taxes, and discounts when available
    Generated by PCPartPicker 2014-08-04 20:49 EDT-0400
  3. So my PC is actually running kinda slow because I have a 400w ?
  4. Best answer
    No, that just means your components don't draw a lot of power.
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