^ not mad on the chieftec Psu , it's enough but low quality.
Everything else is fine, ram speed? Depends on pricing, 2400 performs ok, 3000mhz would better but not if it's €30-40 more expensive.
Just be sure to buy a pair of sticks not a single one.
Ryzen can perform up to 20% better with dual channel memory (2 sticks)
Any other psu's available ?