@Isokolon : No disagreement per se.
That is why I suggest using two or three calculators plus a manual total. Look for a consensus around some recommended wattage.
Component manufacturer's arrive at power consumption via ideal conditions.
PSU manufacturer's likewise arrive at power capabilities via ideal conditions.
Then product manufacturing/quality is likely to respectively increase power requirements (for components) and reduce power availability ( by PSUs).
May be "good" for just enough time to garner positive reviews and then production cutbacks lower the quality.....
[ Cynicism conceded.
]
Once installed, who knows what the real/actual working environment will be? 24/7 gaming or bit-mining perhaps? Overclocking....?
Overall, there has been much discussion for a long time about the subject.
Personally, I prefer to be over wattage. Others not so much.
Key is that the OP can get a sense of what all needs to be considered and then factor in the details relevant to budget, wattage margins, and quality and system use. Then purchase accordingly.
May not be the PSU I would purchase; however that (my selection) is immaterial if the OP's decision is made on an informed basis.