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Quick Answer
The best CPU cooler for the 7800X3D is a quality tower air cooler like the Thermalright Peerless Assassin 120 SE (~$55 AUD) or the Noctua NH-D15S (~$130 AUD). The 7800X3D runs cool at 120W TDP, so expensive 360mm AIOs are unnecessary.
The 7800X3D has a 120W TDP and gaming power consumption of just 70-90W. This is one of the coolest-running high-performance CPUs available. A mid-range tower cooler keeps it well under 80C during gaming.
This dual-tower cooler punches way above its price. It keeps the 7800X3D under 75C during gaming and under 85C during all-core stress tests. Includes two 120mm fans with excellent noise-to-performance ratio.
If you want the quietest possible operation, the NH-D15S is legendary. Near-silent under gaming loads with the 7800X3D, and Noctua's mounting system is the easiest to work with. Overkill for this CPU, but whisper-quiet.
A 240mm AIO is more than enough for the 7800X3D. The Arctic Liquid Freezer II 240 offers excellent cooling and value. A 360mm AIO is unnecessary and a waste of money for this CPU.
Even this budget single-tower cooler handles the 7800X3D in gaming (under 78C). It is louder than premium options but keeps temperatures safe.
Our Verdict
The Thermalright Peerless Assassin 120 SE is the best value cooler for the 7800X3D. Save your money for a better GPU instead of an expensive AIO. The 7800X3D simply does not need aggressive cooling.