What wattage PSU should I get?

Hello. I am building my first computer this summer and would like to know what wattage power supply I should order for it. Here are the specs:

-Intel Core i7-2600k Sandy Bridge processor, overclocked to 4.0GHz, cooled by a Cooler Master Hyper 212 EVO cooler
-NVIDIA GTX 570 graphics card
-2 x 4GB DDR3 RAM
-64GB 2.5-inch SSD
-2TB 3.5-inch mechanical hard drive
-4x 120mm blue LED case fans
-"normal" MSI ATX motherboard, nothing too special about it

I want this computer to be really power efficient. I currently have a 550W Rosewill PSU picked out, do you think I should upgrade to a 600, or 650W PSU?

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More about what wattage
  1. the rosewill capstone 550w (i assume you are talking about that unit) will be fine for your set up. if you are looking at hive series, i would personally go with the 650w version

    Core i7 Test System Specs

    Intel Core i7-3960X Extreme Edition (3.30GHz)
    x4 2GB G.Skill DDR3-1600(CAS 8-8-8-20)
    Gigabyte G1.Assassin2 (Intel X79)

  2. You need a PSU with a single 12A rail of at least 30A, I would get 35 to be safe. If it is multi rail, one should be at least 20A for the GTX 570, and you should not have a problem with the other rails.
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