These are evidently hotspot temperatures. Larger radiators won't make a difference, as your heat output (in Watts) isn't very large. Your problem¹ is not how to get the heat out of the cooler's radiator, but how to get the heat into the cooler's coldplate. As
@Paperdoc said, *maybe* faster waterflow would help somewhat (at the cost of pump noise) although this is again happening one or two steps after where your actual problem¹ is. An actual difference with hotspot temperatures would make:
– sub ambient cooling,
– direct die cooling,
– capping the maximum CPU clock speed.
Core i5-9600K: 14 nm manufacturing process, max. 4.6 GHz core clock
Ryzen 7 9800X3D: 4 nm manufacturing process, max. 5.2 GHz core clock
BTW, all of my own computers happen to run with core clocks of 3.7 GHz or less, and they are all cool and quiet. (Except when they are all on, then it's not so quiet at home anymore...) :
-)
At work, I was given a Dell minitower with Core i7-8700K. I disabled turbo boost in the BIOS for the purpose of keeping the CPU cooler fan inaudible all time. Coincidentally, this too limits the core speed to less than 3.7 GHz.
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¹) It is not really a problem, because <a> you still are well below the thermal throttling temperature of 95 °C and <b> it is not a mobile computer in which a lower power consumption due to lower CPU temperatures makes a difference to how long the battery lasts.