How Much Wattage for my Build?

Okay. So I finished my rig on pcpartpicker for the most part. I may edit some things here and there to shave off some bucks, but I still don't know what psu I need to get. I tried using a calculator, but it honestly confused me with all the options you had to choose from. Pcpartpicker says the estimated wattage is 344W, but I KNOW that is not all I need. That is just too low. I assume that is just the sum wattage of the parts, but not the minimal whole psu wattage required correct? I would assume that because I was expecting to have to get at the very LEAST a 500-600W psu. I don't need any recommendations towards any one psu in general, just the amount of wattage (and some to spare in case I want to upgrade things) Thank you!

PCPartPicker part list:
Price breakdown by merchant:

CPU: AMD FX-6300 3.5GHz 6-Core Processor ($109.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($29.98 @ OutletPC)
Motherboard: Asus M5A99FX PRO R2.0 ATX AM3+ Motherboard ($124.99 @ SuperBiiz)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory ($76.98 @ OutletPC)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($59.98 @ OutletPC)
Video Card: MSI GeForce GTX 660 2GB Video Card ($164.99 @ Newegg)
Case: Zalman Z12 Plus ATX Mid Tower Case ($49.99 @ Microcenter)
Optical Drive: Lite-On iHAS124-04 DVD/CD Writer ($17.98 @ OutletPC)
Total: $634.88
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-12-23 18:21 EST-0500)
4 answers Last reply Best Answer
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  1. Best answer
    You won't need more than 600W, a decent 550-600W PSU will do the job.

    PS: if you are going to upgrade to SLI then you'll need at least 650W, but if by upgrades you mean new HDD/SSD or RAM then you are ok with less than 600W
  2. Any 500+ will do the job. the 344 watt estimate is very close to reality...
  3. Is there a reason I need a wattage significantly over what the site estimates? I mean I knew I would, but I don't understand why.Is there power lost or something? Thank you for the answers btw everyone.
  4. Usually PSUs' efficiency is highest when on 50-70% load, and the higher efficiency the better. This means that less power is transferred as a heat, thus longer lifespan for PSU and PC's components.

    So it's bad to have a PSU that you'll push it to 90-100% load, it will generate more heat and can even cause BSOD and stuttering problems.
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