Can I get away with a 850 watt psu with two 680's?

Hello to all! This is my first thread on Toms forums and I am excited to get some feedback from all of you tech gurus. I am looking for some ideas or perhaps recommendations on a power supply I need to purchase for my new setup I am getting ready to purchase. I am going to purchase the following:

i5 2500k
Asus p8z68-v pro motherboard
8gb corsair vengance (2 x 4gb)
EVGA GTX 680 2gb
1TB Western Digital HD

I have been thinking about purchasing two 680's and going sli and I am tore between purchasing a Corsair Professional Series HX850 psu or this SeaSonic X-Series X-1050 watt psu. I know the 680's use less power and because of that I am curious if I can get away with using a 850watt psu or if I should just get off my cheap butt and purchase the SeaSonic 1050watt psu. I've been using this website to help guide me but it isn't updated yet with the new 680's:

So with the information I have provided, what are ya'lls thoughts?
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  1. Easily
    They use a 90% efficient psu, that would equate to roughly a 50% load on an 850w psu, perfect by most people's standards
  2. I do plan on over clocking the cpu to 4.0ghz. Do you think I will still be ok with 850watt including two 680's?
  3. Yes, check out the system specs from the review, it's an overclocked I7 Extreme with extra bling.
  4. For a system using two GeForce GTX 680 graphics cards in 2-way SLI mode NVIDIA specifies a minimum of a 750 Watt or greater power supply that has a combined +12 Volt continuous current rating of 53 Amps or greater and that has at least four 6-pin PCI Express supplementary power connectors.

    Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Total Continuous Amperage Available on the +12V Rail(s) is the most important factor.

    Overclocking of the CPU and/or GPU(s) will require an additional increase to the combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount needed will depend on the magnitude of the overclocking you are trying to achieve. Your i5-2500K overclock to 4 GHz is very minor and won't even require an increase to the 53 Amps specified above.

    The Corsair Professional Series HX850W (CMPSU-850HX), with its combined +12 Volt continuous current rating of 70 Amps and with six (6+2)-pin PCI Express supplementary power connectors, is more than sufficient to power your system configuration with two GeForce GTX 680 in 2-way SLI mode.

    There is plenty of reserve capacity to handle any overclocking of the CPU and GPUs.
  5. Thank you so much ko888 & dellluser1! I will save the additional $30-40 and purchase the Corsair 850 psu. Thank you again for explaining all of this in a noobie friendly way =)
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