My old PC died on me and I found it as an excuse to go back to AMD.
The Scythe Ninja 5 actually does a relatively good job of cooling the 3900X compared to the stock cooler. I know I could possibly be cooling it more but I like how it looks with the Q300L case.
CPU Idle: 39c CPU Load: 79c GPU Idle: 34c GPU Load: 69c
Down the line, I'm definitely going to get a better PSU (Which is on it's way from EVGA as I'm typing this, but it's just an Evga Supernova P2 850), Motherboard and Case.
The reason I have this mobo and case still was because I initially started with a budget build of a Ryzen 2700 and a 1660Ti. Lol.