Okay so I have done some research and I made thisThen I think you need to reevaluate your PSU budget. The PSU I linked above would still be enough in theory, I'd get something like this: https://www.cel.ro/surse/sursa-modulara-corsair-cx-m-series-cx650m-650w-neagra-pMyU2MjAq-l/
Thank you so much for the help man. I'm gonna take your advice and get the Corsair. Have a good night!An extra ~100 lei is less than 2% of your total build cost. It's your call, but no one on this forum is going to recommend cutting corners with your PSU, which is what powers (and protects) the 5000 lei worth of other components you have.
The be quiet! you've chosen isn't bad, but in general is lower quality and uses some inferior components compared to the one I linked.
Yes, I recommend get 2x8 GB of RAM. I would guess that cooler should be OK for ~4.5 GHz. Your motherboard may also be a limiting factor if/when you want to try for 5 GHz.