To cool a 3900X (overclocked to 4.2 GHz at 1.25v, generating about 170W), a comparison between Thermalright Silver Arrow 130 and Assassin King 120 Mini is here:-
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There are many factors but, basically, 6x6mm heatpipes beat 5x6mm heatpipes. Nothing unexpected.
For AK 120 Mini vs AK 120, the difference in thermal performance is not much (when cooling i9-9900KF)
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Use your favourite translator if graphs do not give you enough data.
My very brief conclusion:- SA 130 is still the king of small cooler. But since you are doing 3900X at stock, maybe your situation will not reap the thermal benefit of the SA 130.
(I have recently built a system with a SA 130. It does have sharp pointy edges but not too bad. I did not use any gloves and still manage to install without any blood...lol)
AK120/Mini/Plus
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