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That CPU will go fine with the Vega.
https://pcpartpicker.com/product/dMM323/evga-supernova-g3-750w-80-gold-certified-fully-modular-atx-power-supply-220-g3-0750
https://pcpartpicker.com/product/64cMnQ/seasonic-focus-plus-gold-750w-80-gold-certified-fully-modular-atx-power-supply-ssr-750fx
would this do the trick
https://www.amazon.co.uk/Corsair-CP-9020131-UK-TX750M-Semi-Modular-Supply/dp/B06X9K8TK6/ref=sr_1_3?crid=2EWHA4P3RGMUF&keywords=750w+psu&qid=1567171463&s=gateway&sprefix=750w%2Caps%2C195&sr=8-3
750w is stated by AMD assuming poor/normal quality PSUs....
A high quality 550w would run a Vega 64, though a high quality 600-650w would leave some extra room depending on your exact system.
https://outervision.com/power-supply-calculator
PSU quality here -
https://linustechtips.com/main/topic/1045610-new-psu-tier-list/
Regarding how bad the bottleneck would be, it differs by game, monitor and graphic settings. There is no single answer. A Vega 64 would be good with a 3770.
Relative gpu quality here (with bottleneck % impact) -
https://www.gpucheck.com/gpu-benchmark-comparison
e.g. 3770 and vega 64 loses 10% due to cpu on average, whereas ryzen 3600 and vega 64 are equally matched
or rough comparison of gpus here -
https://www.eurogamer.net/articles/digitalfoundry-2019-07-17-amd-radeon-rx-5700-xt-benchmarks-1080p-1440p-4k-7001
The Vega + i7 when given the chance will easily pull 400w, I am not going to recommend anything less then a quality 650w unit.