Got a Cooler Master Hyper 212 Plus on it now. Temps dropped like a rock and it is so quiet. Perfect, other than the heatsink is too tall so I can't put the lid back on the computer case!
Also started to overclock it. Only 25% increase from 2800 stock to 3500 for now, but as an accident I undervolted it too! So the overclocked condition is not only faster but using less power than stock. This is insane...
Stock: 2800 MHz, 194W under load
OC'd: 3500 MHz, 182W under load
I'm stability testing this condition as it is a possible sweet spot to use due to the way the multipliers line up with standard clocks for other subsystems. Of course I'm not going to stop here, and will see how far I can go!
I might have to accelerate my plans to switch main systems... basically everything else I have before is feeling so obsolete now.