there are so many variables to such a formula that i think it would be impossible. Loop components, flow rates, fans and their respective performance with given loop components at various speeds, differences in types of hardware used, differences in the quality of the hardware itself(even of the same parts), variances in the quality of the same cpus, etc. A ballpark of +/- 5c might be the best estimate you could attain if such a formula even exists.
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