What wattage power supply do i need and why?

I need to know what wattage power supply to put in my computer i'm building. This is my first solo build and am looking for not only what wattage power supply but an explanation of why I need that wattage. Also any comments on my build or advice would be appreciated. Thank you.

Case: CM Storm Stryker - White Full Tower Gaming Computer Case with Handle and External 2.5" Drive Dock

Motherboard: ASUS MAXIMUS VI HERO LGA 1150 Intel Z87 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

CPU: Intel Core i7-4770K Haswell 3.5GHz LGA 1150 84W Desktop Processor Intel HD Graphics BX80646I74770K

GPU: (I plan to SLI the same graphics card down the road as well.)
-EVGA SuperClocked w/ ACX Cooling 02G-P4-2774-KR GeForce GTX 770 2GB 256-bit GDDR5 PCI Express 3.0 SLI Support Video Card

RAM: G.SKILL Ripjaws X Series 16GB (2 x 8GB) 240-Pin DDR3 SDRAM DDR3 1866 (PC3 14900) Desktop Memory Model F3-1866C9D-16GXM

HDD: WD BLACK SERIES WD1003FZEX 1TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive

SSD: SAMSUNG 840 EVO MZ-7TE250BW 2.5" 250GB SATA 6Gb/s TLC Internal Solid State Drive (SSD)


Liquid Cooler: CORSAIR Hydro Series H105 Extreme Performance 240mm Liquid CPU Cooler, CW-9060016-WW

As well as dual intake fanse on the bottom of the case Ill be installing

Im also going to be putting in blue LED strips
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  1. Best answer
    700-750w PSU. High quality too. (Antec, OCZ, Rosewill, Corsair, Seasonic)
    The 4770k overclocked we will estimate at ~110w
    GTX 770 I've pushed to ~250w with an overclock. Two is now 500w+110w. 610w
    Add in the extras (~50w) and you're at 660w. A good 750w will have no problems with that.
  2. Any high quality PSU from a trusted brand (Seasonic, XFX, PC Power & Cooling are the best imho) of atleast 750w if you want to SLI 770's.
    Here is a great model:

    Never skimp out on your PSU, it is literally the heart of your build!
  3. Super Flower 650W
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