I had similar results going from my dear D15 to the 280 Arctic Freezer II on my 3800x.
Temps are similar or slightly lower, but it has the side adavantadges of, first achieving them with noticeably less noise (the Arctic goes to about 2º of max performance while at 50%), while actually being nearly inaudible at idle (which surprised me to no end, I thought I wouldn't keep it cause of idle noise, since the main point of my build is being silent, or efectively so, at idle). So now my PC is near enough silent at idle, and barely a bother at full load, with fans that don't go over 700 RPM, quite nice.
And second advantadge, it leaves a bit more breathing room to the GPU, that got a couple degrees lower due to not having the D15 on it's back, generally making the airflow inside the case easier to manage, and therefore cooler.
I don't quite like the idea of having a CLC on my sytem, but I have to admit at least this one is pretty effective (here's hoping it works for a long-ish time without issues).
Last edited by Molitro; 12-27-2019 at 04:12 PM.