In stark contrast to Optimus's efforts, I'll offer this:
I am using a Bitspower monoblock, the ROG endorsed one that fits the Crosshair 6 Extreme (image below). Upon arrival I inspected the cold plate area. It was visibly bowed, to the naked eye. Horrible, at least 2 mm higher in the center than the perimeter. It's fairly obvious they used the same machine to make it as they use for the Intel cold plates.
I lapped it down flat with it removed from the rest of the monoblock, when the cold plate is placed back on the monoblock, it picks up a tiny bit of bow again because of the jet nozzle configuration. Happy the majority was gone I installed it on a 3900x, which I did not lap, using Conductonaut and temps are phenomenal, mating is very good now. There is a tiny bit of suction between the cold plate and the CPU when no TIM is present. My cpu, was luckily, quite close to flat.
Idle temps are water + 2c.
R20 with stock voltages and boosting is around water + 36c at all three, TDC/EDC/PPT limits.
R20 with 4.3 all-core @ 1.3v is water + 38.
When removing all TDC/EDC/PPT limits via bios and pushing it, temps rise to roughly water + 45c for essentially zero performance gain, hilarious.
While it NOW performs well, better than the EK monoblock on my X470 system (unlapped and gives water +50c on a 2700x), I would not ever recommend Bitspower to anyone unwilling to put in the lapping work themselves, I shudder to think of how horrid the temps would have been without it if I'd simply unboxed and installed. The mid-process picture below is about an hour into it with 400grit!!
Last edited by tcclaviger; 05-19-2020 at 07:31 PM.