Psus are not all created equal. There's a vast multitude of very mediocre and junk psus that for some odd reason, resemble doorstops. Ppl selling gpus know this, as do (crazily) psu calculators. So psus are often well oversized for real usage.
If you had a top line quality 450w psu, that'd be plenty enough for a 2060. Recommended is going to be 500w, just to cover the calculators butt, and for any doorstop resembling a junk psu, 600w+ would be better advised.
So is 450w enough? Yep, depending on what you have.
Also have to take into consideration maximums. That 455w quoted is all fans, all drives, cpu, gpu, ram, motherboard running at 100% maximum wattage. Which never happens, can't happen. You'd have to manually crank every fan, run Prime95 small fft, memtest64, crystal disk info on every drive, as well as furmark on the gpu, all simultaneously to get that kind of output from the psu. Which doesn't happen. Even with Heavy gaming, you'd be looking at @ 70% psu loads at best. Pulling @ 350-370w would be more accurate overall. Well within a quality 450w range, but a little high for mediocre and well over the 50% range of junk vs claimed wattage.
You don't need 455w to run the system, it'll run on less than 100w, you need 455w to cover any possible maximum wattage use. There's a difference.
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