Best Pc requirements for this emulator

5700 XT is more than enough, but note that there are some issues with Windows AMD drivers that are not yet worked around on the current master versions, so you may have some graphical issues until those are worked around, unless you're using the RADV driver on linux.

Go for the 3700X if you can, the extra cores help a lot. If you can't, the 3600X is also decent.

Do i have some way to find out, which part of my platforn need to upgrade?

I mean, how i can get, which cpu i need: with more cores or frequency? What kind of ram?