Just to confirm:
1) System sans dGPU
http://www.tomshardware.com/reviews/core-i7-4790k-devils-canyon-overclock-performance,3845-9.html
2) GTX1070 OC:
http://www.guru3d.com/articles-pages/nvidia-geforce-gtx-1070-review,8.html
140W + 160W = 300W
I believe that's power FROM the PSU, not from the wall. We could have GPU power spikes too, but then the CPU is usually not at 100% load during games anyway, so we'll stick with 300W.
You can have more FANS etc, so we'll estimate normal gaming load as:
about 60%
may see spikes up to 75% or so.
OTHER:
FAN NOISE may or may not be too loud depending on how picky you are.
THIS PSU is the EVGA G2 which has an ECO MODE so it can turn its fan on below 325W (50% load):
https://pcpartpicker.com/product/9q4NnQ/evga-power-supply-220g20650y1
Not sure about ALL EVGA PSU's but I found that with ECO MODE off the fan was far too noisy. I got my dad a Be Quiet and it had no Eco Mode but it was much quieter under heavy load than my EVGA with the fan enabled.
Your current PSU should work fine. Frankly, it's very difficult to know how reliable some of these power supplies are. I hear all sorts of NEGATIVE COMMENTS by people who simply repeat what others have said, but MTBF (Mean Time Before Failure) may be high for your power supply.
Having said that, higher quality isn't just about power stability, or the PSU failing but it includes better PROTECTION circuitry too to prevent damage to other components if you have problems.
**AND**
I use a voltage regulator as well. The APC Line-R 1200VA:
http://www.apc.com/shop/us/en/products/Line-R-1200VA-Automatic-Voltage-Regulator/P-LE1200
It has some surge protection, however it's best feature is it can protect from AC voltage that is constantly TOO HIGH (dissipates as heat).
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