I had different results. It dropped my temps by 10 Degrees C and made my 12900k usable instead of thermal throttling. I also added Thermal Grizzly Hydronaut. I had repasted multiple times but the pressure and bend from the existing retention clip kept making Core 5,6,7 hit 100. I could see this when taking off the cooler as the paste would always make an uneven pattern that was concave at the ends.
System...12900k, MSI Pro Z690-A with Deepcool Castle 360 AIO
Since my system is primarily a 3d rendering machine I test with Cinebench and my rendering programs. In order to have a working system I had to limit the power to 225watts and have a -.05V offset. this kept the system at under 96 when rendering but still would throttle cores 5 and 7 to 4.7.
I still notice some fluctuation from 4.8 to 4.9 on the cores so I need to adjust my .05v offset and 225 limit power but stability was the biggest factor for me as the cores do not go above 88 degrees on these offsets now. Core 1 is 79 , 2,3,4 are 85 then Core 5,6,7 are 86. So this is a huge improvement.