NH-D15 + 3900X

[Forceflow]

I switched from an AIO which gave me nothing but trouble (Kraken Z73) to the best air cooler I could get: Noctua NH-D15. I knew that going from a 360mm AIO to an air cooler would cost me some temperatures.

My case is not optimal for airflow (Fractal Define R7, top closed, front door closed), and I'm seeing temperatures of 60 -> low 70s while gaming, and 79C when I'm stressing with Prime95 (small FFT's) or Realbench.

During gaming (Warzone), the spikes to 70 degrees are very short - I only notice them because I'm tracking the hottest core (TCtl)

Is this to be expected on a Ryzen 3900X?

 

[Forceflow]

@Ross Thomson
Stock, memory XMP profile enabled (3600 mhz), PBO on "auto".

@doyll
Thank you for that extensive answer! I've ordered 3 Noctua NF-A14s,which should perform a lot better than the standard Fractal design fans in the front.

I'm currently using the vented top (with holes), because I figured warm air ... rised? You think that's not beneficial voor airflow?