Interesting that they can actually do so much with the PCB's capabilities... I would not have expected that at the space of the PCB, more like improved cooling of the heatsink etc.

Memory cooling can vary pretty drastically based on the smallest differences in your case. If you've got a down-firing heatsink, I'm sure you'd have very little RAM cooling issues (at least for the ones nearest to the CPU). If you've got all your components liquid cooled with little to no direct airflow over the RAM, expect speeds like this to overheat regardless of what kind of heatsink is on it. I personally would opt for active cooling for speeds this high.

How necessary is it? I never seen my GSkill DDR5 ever come close to those temperatures.

Undying:

How necessary is it? I never seen my GSkill DDR5 ever come close to those temperatures.

My Gskills ripjaws at 6200 CL30 1.4V can reach 70C when gaming, because of GPU heat in the case. They are dual sided 32GB sticks and the thermal interface looks more like tape then something that actually transfers heat. Real thermal pads would probably lower the temps more then this coating would. 3X 140mm fans in the front and a 140mm fan sucking air from around the modules and into the CPU tower cooler and out the back.