Power calculators can be deadly accurate IF... you have accurate inputs.
What might be your capacitor ageing?
What might be your future requirements?
What is the right safety margin?
and so on.
I find this chart to be most useful.
http://www.realhardtechx.com/index_archivos/Page362.htm
RX570 will be about 500w.
I have no problem overprovisioning a PSU a bit. Say 20%.
It will allow for a stronger future graphics card upgrade.
It will run cooler, quieter, and more efficiently in the middle third of it's range.
A PSU will only use the wattage demanded of it, regardless of it's max capability.
I would look for 550 or 650w.
Perhaps more important is the quality of the psu.
Some cheap units are downright dangerous and can destroy all they are connected to if they fail under load.
Less dangerous is a unit that tends to fail or is noisy.
Buy no less than a tier 3 unit from a list such as this:
Credit to @Starelementpokeand @Energycore for helping out with this long-awaited refresh of the old PSU tier list by Aniallation (who previously went several months without logging in), leaving the old list in need of help. This is simply an update of the list that was flawed in creation by the P...
linustechtips.com
I like the Seasonic focus units.
Seasonic usually has sales around this time of the year, so look for them.
This unit has a 10 year warranty.
https://www.newegg.com/seasonic-focus-plus-550-gold-ssr-550fx-550w/p/N82E16817151189
And... I would not buy that adata SSD.
On newegg, it gets some 39% one egg reviews.
https://www.newegg.com/adata-ultimate-su650-480gb/p/0D9-0017-00097?reviews=all
Much better is the Samsung 860 evo which is also much cheaper:
https://www.newegg.com/samsung-860-evo-series-500gb/p/N82E16820147674
You also might look at the m.2 format.
It needs no power or data cables.
The 970 evo is a pcie device with 4x the sequential speeds and still costs less than the adata:
https://www.newegg.com/samsung-970-evo-500gb/p/N82E16820147690