AMD EPYC processors have a multi-crystal layout (so-called chiplets), which is why the size of the CPU is cumbersome, and apparently, the tendency to increase their CPU size will continue in the future. Since the crystals in such a processor are not located in the middle, and in General from series to series can be located in different ways, the CPU cooler will not be able to design so as to place the heat-conducting tubes over the core, which means that the same cooler with different processor models can show different heat dissipation efficiency. To eliminate this effect, manufacturers have to use a thick copper sole and have heat-conducting tubes longitudinally. For this reason, coolers for TR4/SP3, as a rule, are placed in a separate category, and are not compatible with anything else (this does not apply to watercoolers).
If we look at the base of a conventional cooler, it will look like this: a large sole, and in the center above the CPU core laid heat pipes. Here in the photo below you can see a typical mistake of the company Cooler Master, which applied the traditional design of the sole in the cooler Masterair MA621P TR4 Edition: heat pipes pass only over the center of the processor, and the temperature gradient in the aluminum sole can be 10 degrees, which is enough to hang the system at Of course, it would be correct to deploy the base along the heat conducting tubes, as Noctua did in its models for AMD ThreadRipper / EPYC processors.
^^ Cooler Master fault in MA621P TR4 Edition ^^
In most liquid cooling systems, as a rule, the sole has a round shape, and against the background of the processor, the design looks absolutely ridiculous, although compatibility with TR4 / SP3 is stated in the product characteristics.
^^ Typical location of the watercooler heatsink (photo GamersNexus) ^^
The area of contact between the processor and the cooler has increased 4-5 times over the last decade, the size of the radiators has not changed, and to keep the noise level low, you need to take into account the location of each heat-conducting tube, because noise (in addition to reliability) is the most important criterion for buying a hi-end cooler.