You replaced the stock paste with something better? Also, the paste has to spread on all the surface area. So, may have to spread the paste due to the placement of the dies. One more thing, only use one monitoring app at a time. If Ryzen Master, then that's it.
By Built-in Benchmark Queen:
My 2.5 years old delidded 7980xe @ 4600mhz all core with 49ns memorylatency (4000c16 twekaed) is faster than 3950x max overclocked on water in every scenario. Pretty good for a ancient cpu
In gaming it has no chance vs my new 10900k @ 5400mhz and 4600c16 tweaked memory. ~35ns memorylatency.