Questions about power Computer

[Tithanos]

I want to take a PC with a ROG STRIX Z490-E GAMING, a 

Intel Core I9-10900K 3.7GHz, an RTX 3080, and 32 Ram memory.

Should I take 850 watts? If not less or more?

 

[Orange1]

Usually 500W is plenty for most situations of normal use. Also depends what you will do with it later, so might want to go more with 650W if you plan on using more power later on. 850W seems like too much, but again depends on what you are going to do with it.

[GoldenLag]

2 hours ago, Tithanos said:

Should I take 850 watts? If not less or more?

what PSUs are you looking at?

[chaosys]

850W is pretty much the right choice.
10900k and 3080 are serious power hogs. The AIB‘s 3080 (I.e ROG Strix) can easily go up to 400W alone and the I9 with mce takes another 250/300W.

If you do not overclock (no mce, xmp or anything else) you might get away with a 700W unit but not less.