How do i choose the right power supply unit for me? how many watts

i am confused at power supply units PSU how do i choose the right amount of watts for me?
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More about choose power supply unit watts
  1. You could supply your system info and get reccomendations from forum members,
    or use a psu calculator
    http://extreme.outervision.com/psucalculatorlite.jsp
    Then come back and ask for a reccomendation for a decent quality unit in the wattage range it gives.
  2. the parts of the pc that draw the most power are the CPU and the GPU.you can find how many watts a cpu-gpu consumes by benchmarks over the internet.you will be able to find how much power you need if you total the watts that the cpu and gpu draws...for axample,you have a cpu that consumes 120w in its peak and a gpu that consumes 160w in its peak so you will need a350-400w psu(it really needs 280watts,but you have to take pracautions in case of an over load and stuff like that,so i would recomet to pick a psu that has 100w more than what you need) . if you want the easy way use psu calculators such as the one that delluser1 recommended you.
  3. If u have a "normal" setup (no overclocking, a CPU that uses around 90-150W, a GPU that uses 80-130/140 watts) that uses about 340-400+ watts, u should get one of these:

    http://www.amazon.com/gp/aw/d/B0092ML0OC/ref=mp_s_a_1_1?qid=1385925926&sr=1-1&pi=AC_SX110_SY165_QL70

    http://www.amazon.com/gp/aw/d/B0092ML0MY/ref=mp_s_a_1_2?qid=1385925990&sr=1-2&pi=AC_SX110_SY165_QL70
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