I took out the eVGA CLC 280mm (Asetek design) cooler from my backup rig and put it in my main (swapped out fans for Thermalright 140s since eVGA stock fans are horrible).
Previous post showed low-end air cooler with 92mm mini tower heatsink (marginally better than Wraith Prism of AM4 fame).
Compare to eVGA CLC 280mm at same settings (PBO/90W PPT, 6000 CL36 memory), full AIDA64 stress test CPU/FPU/Cache/Memory:
Almost 11°C lower at full load, about 30MHz higher sustained all core clocks. My ambient temp is 79F/26C so most could do better.
7531 --> 7654 in MT performance at 90W PPT.
Guru3D review showed 771 ST / 7893 MT in CPU-Z. This means I am achieving 100% ST performance and 97% MT performance at max 90W PPT versus stock 142W PPT. That's a massive 37% CPU power savings at full tilt. I haven't even messed with CO yet.