I googled the 770 and saw that 42 amps on the 12 volt rail. I just cannot believe at 100% load the video card alone could pull 42 amps I am almost positive that is for the whole system considering a corsair tx650v2's 12 volt rail goes up to 53 amps and has 2 6+2pin pin PCIE connectors and could easily power pretty much any single CPU and GPU.
The corsair tx750v2's 12 volt rail goes up to 62 amps and has 4 6+2pin pin PCIE connectors could SLI a pair of 770s with your cpu.
Also for reference The corsair tx850v2's 12 volt rail goes up to 70 amps and has 4 6+2pin pin PCIE connectors.
This is the current PSU I am using with 2 heavily overclocked 965 core 2400 mem @1.075 volts from 822 core and 2003 mem @1.025 volts 560 ti cards in SLI with a overclocked 2600k between 4.5 and 4.9 ghz depending on winter or summer for well over 2 years.
And that's with Nvidia saying a single 560ti need 30 amps and 170 watts on the 12 volt rails and I am using 2 of them overclocked a good 20% so you can say i a pulling 36 amps or better along with 205 watts or better x2 so that would put me at 72 amps 2 amps over my PSU's limit. I just added 20% to the power since i am using more then stock voltage and a 20% increase in core and memory speed, But it is probably 25% perhaps higher then that since when you overclock it greatly increases leakage and power draw once you add voltage and overclock MHZ.... Plus that does not include my 2600k @ 1.3+ volts 4500mhz+ 3x 2tb HDD, 1 SSD, 1 AIO 120mm liquid cooing system with a pump, 5x 120mm fans, 2x 200mm fans and a lighted USB Black widow ultimate keyboard and matching Imperator mouse. Also my PSU's 140mm fan is heat controlled and it rarely turns on ..in fact I have to clean my PC every 3 months from dust buildup on all my 200mm, 120mm fans and GPU fans etc. But my PSU fan is always clean so I do not even think it comes on. Since it only turns on when it gets hot enough.
I figured it might help you decide since NVIDIA and AMD greatly inflate there power requirements for there video cards. My 560 tis are built on a 40nm process with a 360mm squared die with 1950 million transistors. The gtx 770 are built on a 28nm process with a 294mm squared die with 3540 million transistors and a peak power consumption of 230 watts. For comparisons sake A sandy Bridge-E 3970x with 4x4gb quad channel memory @ 4800mhz "wow":) system with a GTX 770 fully loaded on crysis 3 with max settings @ 2560x1440 the WHOLE system pulls only 475 watts. Under a 2d idle It pulls 225 watts from the wall socket. So the actual wattage pulled is a good 10-25% less once you consider efficiency of the PSU itself converting 120v to 12v. Below is the link to the article.http://www.xbitlabs.com/articles/graphi ... html#sect1
I hope this helps in some way and makes some sense
Also 90 to 100 amps is all that is needed for a mig welder that runs off of 115 volts so 42 amps from a 770 card alone, I highly doubt it.
2600k@4915mhz CM Nepton40XL 16gb Cas9 1600mem 2x EVGA GTX770 4gb Classified cards in SLI@1280mhz Stock boost core and 1995mhz mem SBlaster Z powered by TX-850 PSU 2xHTPC's Both w/i3 2120's,1xasus LP HD6570@850core 1000 ddr3mem 1xHIS hd7750@1125core1400mem